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Cephalexin

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Overview

Keflex belongs to a class of potent antibiotics called cephalosporins. It is one of the first of these to become available generically and is now often prescribed as cephalexin.

This drug works against a wide variety of germs, including those that cause infections of the skin, lungs, throat, prostate, urinary tract, bones, and ears.

Cephalosporins are broad spectrum medicines that were originally discovered in one of the world's most unlikely locations.

A fungus found close to a sewer outlet along the coast of Sardinia turned out to cure a number of nasty infections. From this chance observation many extraordinary antibiotics have been developed.

Side Effects and Interactions

Side effects from cephalosporin-type antibiotics are generally mild. Nevertheless, cephalexin can cause a range of digestive tract disorders.

Indigestion, stomach pain, nausea, vomiting and diarrhea have been reported. If diarrhea becomes severe contact your physician, as it may be a warning of drug-induced colitis.

Other infrequent reactions to be aware of include rash, itching, vaginitis, headache, confusion, joint pain, fatigue and dizziness.

Cephalexin may affect laboratory test results. Liver enzymes may become elevated and false-positive results may show up during certain diabetes tests. Make sure that the laboratory personnel are aware you are taking cephalexin if you have blood drawn.

And remember to report any symptoms or suspected side effects of cephalexin to your physician promptly.

Special Precautions

If you are allergic to penicillin-type antibiotics, alert your physician immediately. Some people who are sensitive to penicillin may also react to cephalexin.

Symptoms such as breathing difficulty, wheezing, sneezing, hives, itching, and skin rash require immediate emergency treatment.

Life-threatening anaphylactic shock may produce an inability to breathe and cardiovascular collapse and can occur within minutes of exposure.

People with kidney problems should receive cephalexin only under careful medical supervision as the dosage will most likely have to be modified to prevent toxicity.

Taking the Medicine

Although this antibiotic is absorbed more efficiently when it is taken on an empty stomach, the pills can be swallowed with food, especially if they upset your stomach.

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64 Comments

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The first time I took Cephalexin because I had an ingrown toenail. I also developed a rash on my penis. I did not relate the two together. But I just got another ingrown toenail and my rash is back. I cannot discribe how furious I am. This rash lasts 4 weeks and is excruciating. What can I do?!!

I also got a rash on my penis after using cephalexin. It lasted 4 weeks and was unbearable! Its healing and scar tissue has resulted in premature ejactulation due to hyper sensitivity and has ruined my sex life! Gee thanks a lot Doc! Anything I can do to fix this?

I am female and taking this drug to treat strep throat and a bacterial eye infection, and it is helping my throat and eyes to feel much better.

I have taken Cephalexin (dosage of 500mg) for my bronchitis -- I'm allergic to certain chemicals, and I take every precaution to avoid them, yet sometimes they sneak up on me when I least expect it -- like a freshly opened and inflated air mattress for example. Make sure you air out one of those things for at least a day or two before your guests sleep on it if they have any kind of chemical sensitivities. But I digress.

I don't recall any side effects so I guess I'm lucky in that regard. However, it did 'seem' that with this last attack in October ('07), the meds just didn't work as quickly as I "thought" they should.

My main concern is that the anti-bi's purchased from XYZ pharmacy may not have the same potency as MNO pharmacy. Or that the potency may be reduced altogether no matter where you purchase.

I know the Graedons have spoken out about this, but is the "establishment" listening ? ? ?

Re the 'rash', would Calendula gel help??? Touch base with your doc, but it wouldn't hurt to ask, right?? You should be able to find it at your local health food / organic / natural products store.

To the two people who had penis rashes. I am not a doctor, nor do I attempt to play one on the interweb, but I'd suspect that you both may have herpes & had a breakout due to the stress/toxic overload your system was under while on this med.

Look up Herx reaction or just...
http://en.wikipedia.org/wiki/Herxheimer_reaction

My penis is red and swollen ... have finished the the course of ceph ... dont think i will do this drug again ........ just when I got my wife motivated for sex!
Jeez louise

I had a tooth removed and began taking cephalexin because the removal was surgical and the dentist wanted to be proactive in case there were any problems with infection. Roughly two days after starting the medication I got a terrible cough and fever. I tried medicating with some Tylenol Warming Cold and Flu.

I started to get a severe rash. At first I thought it was a reaction to the cold and flu, but after only taking it once, and continuing the cephalexin, I noticed that the rash kept getting worse.

I developed an overall sense of confusion, slept long periods of time, was constantly sweating, and just could not function. The rash went almost everywhere. This is why I wanted to post. As for the guys saying that they only got the rash on the penis, then I consider them lucky. I am going to side with MG on this one. The reason I wanted to post was that the only place I did not get the rash was my penis. Strange enough as I was, with bumps inside my nose and on the bottoms of my feet, there were never any indications there.

Is keflex recommended for gum infection and gum disease? Also, does this antibiotic contain any sulfonamides?

My one year old baby recently had a febrile seizure which was due to a temp of 105. She was ill with bronchitis and tonsillitis and the emergency room doctor put her on Keflex. That morning we noticed a terrible rash and wheezing like sound she was making. We took her to her own medical doctor, in which she told us to stop the Keflex and start her on Benadryl. My only concern is that this might ignite another seizure or something even more dangerous. Please ease my mind!!

I have been taking cefalexin for like 5 years. Really helps to clear up my acne! Works really well. There had been occurrences within the past years of me getting dizzy sometimes. Very rare. It wasn't until years later that I realized that most likely those happened because of the antibiotic. Random when they would happen, but I think that's the explanation. I remember one day I just got dizzy and it lasted like 1 or 2 minutes long. I was worried and sat down at school because I thought maybe I would pass out and wasn't sure what was going on.

One day though I was dizzy ALLLLL day. It was the weirdest thing I have ever experienced. I went back to bed and woke up later to see if it helped but I was still dizzy. Up until I went to bed that night and woke up fine the next day. Not sure what this confusion thing means. How do you just get confused? Buttt.... it's really hard to tell if these are my side effects or if I am just tired usually. I've been off and on the pill just to see... and it's hard to tell. For the past year, my eyes have hurt so badly that it makes me feel tired.

Eye doctor said my vision was perfect, so maybe it's cefalexin? I stopped taking for a couple weeks and still my eyes hurt but now that I'm back on, they hurt more. NOT SURE WHATS HAPPENING! But all in all, cefalexin hasn't been too crazy for me. How much are you guys taking!?? I take 2 500 mgs a day.

Also, from going off and back on I have noticed that my stomach has been a bit sensitive and I actually fart a lot. After coming back on the medicine I recognize the smell and realize it has been causing a lot of my gas actually. I just thought I was always a gassy person but its because I have been on this medicine. Wish there was a better way to have no acne.

I took this medication for a skin infection on my arm due to a minor burn. I had the same reaction near the end of the treatment cycle. A red itchy rash on and around my penis. The itching is unbearable. I also now have several "patches" on my waist, legs and sides. They itch horribly and if I scratch them - like I have while sleeping, they bruise badly. I have had the rashes for about 2 weeks and they are not getting better. My doctor said I have contact dermatitis but looking on the web it looks like its actually an allergic reaction to Cephalexin.

The poster is right about the sensitivity of the penis. I have always been slow to orgasm which I viewed as a good thing, not anymore. I hope this side effect does not last long.

I went to my docs with a lump in my breast tissue. He prescribed me with cefalexin. I took two tablets (each 500 mg) one in the morning and one at lunchtime (I was told I should take 3 a day) and half an hour after the second tablet, I came out in a rash. I stopped the cefalexin and started some antihistamines. 5 days on and I want to peel my skin off! The itching is even on my ears - I'm allergic to Penicillin as well, and have since found out that cefalexin is related.

There is a lot of skin surface coverage of this rash, and I've tried Eumobase to stop the itching, which just leaves me sticky & greasy (yuk)
How long is this going to last?
Someone mentioned 4 weeks??!

About two years ago I was diagnosed with Bronchitis. I was given Rondec and Keflex. Within 3 days of being on the medicine I was constantly dizzy and nauseous, and even had a harder time breathing. I was at my brothers football game when my whole body went cold and I felt like I was about to pass out. I went into a panic attack and my whole body went numb.

Luckily my doctor was there and said I was having an allergic reaction to the Rondec. Well, about 3 weeks ago I was put back on Keflex for an upper respiratory infection. I started to experience the same thing and had another panic attack. My doctor just told me it was because I was having a hard time breathing as is. So, I did not pay attention to it. I stopped taking Keflex because I felt better. And, just last week on Tuesday I had another mild panic attack.

I started taking Keflex yesterday at 10:30am. At 1pm I started feeling nauseous, dizzy, my chest was getting heavy, fingers and face were starting to tingle and go numb, my hands locked, and my face went numb and locked up. My brother rushed me to the ER and they did blood work to see if I might have a problem with my blood sugar or Thyroid. All tests were normal. They gave me an Ativan to calm me down and I was fine for about 20 minutes.

On my way home in the car I felt the same thing starting again. I became light headed, dizzy and nauseous. My hands and face locked up and it felt like someone was sitting on me. My parents took me to the ER again. At first they thought I may have a blood clot in my lungs. I was not hyperventilating or coughing. I felt drained and weak, almost like having the flu. I was at the ER for 9 hours and they told me they could not determine what caused the lock up in my hands and face. So, I woke up this morning and researched allergic reactions to Keflex.

One of the severe reactions was a seizure. I feel a lot better today, but I feel like I was misdiagnosed by the ER staff and they did not fully investigate what was the cause of my possible seizure or severe reaction to Keflex.

I recently took cephalexin for a urinary tract infection. I am female. On the last day of taking it (day 7) I developed a rash on my labia, we're talking burning, itching, swelling, deep tissue pain, and skin sloughing off/peeling off. I believe the men with the penis rashes have the same problem as me-an allergic reaction to cephalexin. I will make sure to make a noted of this med to NEVER take it again. I suggest you all do the same.

Follow-up.

My doctor now says its hypersensitivity vasculitus, an allergic reaction to the antibiotic. After 2 rounds of prednisone and now taking 3 allergy medications at once, the rashes only flair on occasion and don't itch nearly as much. My doctor said it could last weeks or months based on his experience. The prednisone works wonders but is not good for you long term. The allergy medications make me sleepy but its better than the horrid itch. I need to get an allergy warning card for my wallet so I am never given this medication again.

I've almost finished my course of Cephalexin and I too have developed a dry, inflamed and swollen labia in the last few days. Usually, without fail, I get a yeast infection from antibiotics, but this time, I have the above symptoms. This inflammation is really uncomfortable. I think I know how menopausal women feel. It hurts to wipe when going to the toilet, I can't wear tight pants and I need to use KY Jelly to ease the discomfort. For the record, I do not have any STD's. I was put on Cephalexin to treat a recurrence of a kidney infection (the last antibiotics were useless) and whilst my urinary problems have gone, it's come at a price. I don't ever want to take this medication again.

Anyone experience tooth sensitivity while on this drug?

I was given Cephalexin 500mg 3x a day by my dentist for an infection of my jaw bone. While my mouth is feeling much better the rest of me is not. I spent the first few days throwing up and nauseous. Now I'm just nauseous. But then began a burning sensation and I thought I got a yeast infection. I was prescribed medication for this but the symptoms are getting worse. My labia feels like it is raw and on fire. It is actually peeling. The pain is unbearable. I tried applying Vagisil but that only made it worse. I was really getting worried that this might be something serious but it sounds like others have had the same reaction to this medication. Wish they would post better warnings about this drug.

I just found this forum while researching the relationship between cephalexin and herpes. I'm currently having the first outbreak I've had in 6 years after starting a course of cephalexin the day before. The way I understand this antibiotic to work is that it finds and explodes virus cells. This sounds perfectly wrong for a virus lying dormant in your ganglia. This may have a completely different effect for people already having regular outbreaks and I have nothing to back any of this theory up. Just thought I'd share :-)

@Stephani - I came to the PP website because of a tooth issue - but mine is the opposite, two top front teeth and top lip are going numb shortly after I take each dose of Keflex.....

on 500mg Keflex qid, along with high dose Prednisone for a severe case of systemic poison ivy (woody vine pieced skin deeply - severe skin structure infection plus poison ivy).

@ group - Odd thing is that I have noticed rashes all over my body and the poison ivy did not begin abating until after the dosage was jumped up (60mg/day with taper). I have rashes all over my body now, they bruise badly if scratched. Thankfully, nothing on the genitals as of yet.

My lower back/hips are aching after taking 7 days of Cephalexin at 500mg each pill twice/day. I read on internet that Cephalexin can cause arthritis. I was looking for a cure duration, other sufferers...any help?

After taking cephalexin for one day for a UTI I broke out in a rash that I later found out was Stevens-Johnson Syndrome. I was burned from head to toe and from the inside out.

It has also caused nerve damage in my feet. If another doctor had not taken me off of it
I could have had more severe problems. As it is I am not disabled.

I had a tooth extracted on Tuesday. The dentist gave me Cephalxin because, the tooth was infected. Thursday morning I got up with a fever and coughing up green stuff. I ran a fever of 102. Today is Saturday and I'm still sick. How can I get a lung infection taking this medicine? I do feel better today. I'm taking 500mg 4 times a day.

sounds like you need probiotics to keep your intestinal tract normal. without it I have the same problem

I took this antibiotic for a urinary tract infection. It cleared my infection up after a couple of days, but then caused thrush, and a skin rash on my belly. I couldn't say what was worse, having a UTI or putting up with the side effects of the antibiotic.

I was diagnosed with severe eczema in Feb. 2011. I was given two prescriptions: an ointment to apply twice daily and cephalexin capsules to take 3 times daily for 10 days. Also to take special baths 3 times a week. In addition, I bought a whole house humidifier to add moisture to our apartment during this very dry winter.

The eczema started clearing up within a few days and slowly got better over the course of a week or so. Then I started developing another rash on my chest which was never there before. My dermatologist was out of town but will return next week. I obviously got the rash from taking the cephalexin which I stopped taking before finishing it.

I never in my entire life had any reaction to an antibiotic until now. I will never take cephalexin again.

Thank god I'm not the only one. I recently started taking this anti-b for an infected back tumor thing that had to be taken out. I never had itched at all on my body before. After starting this I noticed my private area started itching and about the middle of the course it is driving me insane!!!! I'm only 22 and scared I somehow got an STD even though I haven't been with someone in months. Should I tell the doctor and start diff meds or just finish them and it will go away?

PEOPLE'S PHARMACY RESPONSE: BY ALL MEANS TELL THE DOCTOR, AND ASK HIM OR HER TO HELP YOU WITH THE DECISION TO CONTINUE OR SWITCH.

My doctor says, for me, its hypersensitivity vasculitus, an allergic reaction to the antibiotic. Basically the arteries and capillaries are breaking down resulting in the itching and bruising (internal bleeding). I was told to never take it again as it could be life threatening for me. See my post above. It took quite a while with a strong steroid to become well again.

A doc misdiagnosed me with impetigo and prescribed Keflex. I took it twice and developed a rash over most of my body. Especially bad on my neck shoulders and arms. The rash is mildly itchy and looks like many little red bumps spread almost evenly over the affected ares.

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is 500 mg 4 times a day of cephalexin too much? I took it for a sinus infection for 10 days. Also, I did not drink a full glass of water with each dose all the time. Would there be any harm in that? Just hope I did not mess up my intestines. Also, no one told me to eat yogurt when taking antibioitcs. How does the gut flora reestablish itself? Will this happen naturally over time? I did not experience any loose stools but 14 days after taking it. I had lower right quadrant pain. Later found out I have small ulcers on my ileum. Doctor is not saying it is crohn's but in the back of my mind I am wondering if this antibiotic caused it.

PEOPLE'S PHARMACY RESPONSE: THE DOSE YOU MENTION IS RIGHT IN THE MIDDLE OF THE RANGE DOCTORS USE.

I started on cephalexin 3 wks ago for uti infection......OMG!!! "The Rash"horrendous!!! an still visible under my skin! but I have now developed slight swelling in my finger, wrist, ankle joints.... I hope this isn't gonna last to long, I'm back at the doctors again tomorrow, will keep you informed. My doctors have told me the rash is an reaction to the cephalexin, I can never have it again... Ironically I was in no pain when I first went the doc's, just slight blood spotting in my urine, but due to the meds, I'm a wreck!!

I have been dealing with labial itching and a rash which started on my back and torso, moved to my extremities and is now concentrated on my legs. Keflex (Cephalexin) is the only med which seems to help. I have since become convinced that I have an underlying genetic disorder (my father also has symptoms) which caused the itching and a bacerial infection which came from me scratching. The Keflex does appear to be helping the infection and I will be undergoing tests to confirm the hereditary problems which I believe to be a genetic form of Beriberi (Thiamine deficiency).

Chephalexin caused my skin to have open sores all over body. Also I am not sure if it reacted with Vitamin E, Omega 3 Fish Oil, Vitamin B12. Now 8 months later, my skin got itchy again and open sores. How long does it take for the drug to completely disappear from my body?

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Hi your side affect sounds exactly like mine. My feet, ankle, wrist and finger joints are so painful and this is 5wks after stopping the medication, because I had a terrible poison ivy rash all over my body. I have a specialist appointment Mon. 4th July 2011. I am hoping they can tell me that this horrible sore, hot aching will go away very soon an that it will never reoccur.

I appreciate it if you could tell me how long your side affects lasted for & have they ever reoccurred.

Thank you, a very sympathetic friend.(Betty)

Once the 2 courses of prednisone knocked it out of me, it did not come back. I do however avoid antibiotics in this family.

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I have been taking this antibiotic for 3 days now, 500 mg every 6 hours for a tooth infection. The tooth infection has not completely gone away yet. I am experiencing excess gas. I have never farted so much in my life. Long, loud ones all day and night. I don't like it. My stomach is all blown up and uncomfortable. I have not had any labia itching or swelling or rashes on body. It did clear up the pimples I had on my back lol.

While traveling abroad I got extremely swollen feet and legs and then a rash. Upon coming home could not get into my Dr. and spent one day in Urgent care and another day in emergency. Emer. put me on 2000 mg. of Keflex a day, this is my third day and I am broken out all over now, arms legs, stomach thighs, etc. extremely itchy! My legs and feet are a little better as long as I keep them elevated... I have another call into my primary care phys. telling him I HAVE to see him... I am positive I am having an allergic reaction to this medication, I know I am allergic to penicillin. What if my Dr. still does not see me?????

I hate when doctors are over booked and won't see you. Maybe you should go back to the urgent care even though its expensive or ask to see another doctor in the office.

You could also just show up at the doctors office and tell them you are having an allergic reaction. I can ensure you they will not turn you away as the liability would be great.

I was put on this medication to treat a UTI and within an hour I began Vomiting and had uncontrollable Diarrhea. I have never been so sick. A year later I switched doctors after a move, had symptoms over the weekend for which the new doctor called in a script for me. Unfortunately the pharmacy neglected to transfer my allergy information when my name changed. Once again within the hour I was puking and on the pot again. I no longer assume and immediately inform all medical professionals when asked about allergies/sensitivities. To this day I still remember the smell of keflex... that alone could set me off puking.

Hi Jennifer,

I took Keflex (Cephalexin) 500mg for a small rash on my nose 4 times a day !!! For me it was 2222 much and from the second day, I had severe diarrhea (loose watery stools). Someone told me, its common while on antibiotic and I continued my 10 day course.

The rash became more red/inflamed which even now exists. I realized now that I should have stopped it on the second day. I don't understand why the doctor prescribed this to me that too 4 times a day!!!

Although my rash is not as severe as before while I was taking Keflex (actually was taking to heal it), it looks like it takes more time to become normal.

Cause : Internal gut flora is completely disturbed and it takes longer time for it to reestablish is what I heard....

Hope this helps !!

I recently took Keflex for a bacterial infection caused by a stingray. I never take antibiotics for anything that I can treat naturally but this was a very serious infection. Two days after coming off I experienced horrible flu like symptoms and aching and extreme pain all over my body. I also developed a rash on my chest and about 7 large boil-like lumps on my shoulder.

I did take probiotics during the course of antibiotics. It is one week later and I am only slightly well even though I have received acupuncture and all types of cleansing therapies. I did not notice joint pain mentioned by many people but it is definitely my main symptom. I assume it will continue to slowly get better but I would avoid this antibiotic in the future.

I believe that many of the people who are experiencing rashes in their genital area and elsewhere could have an overgrowth of candida. I am a holistic practitioner and treat people for this very often. If you suspect it then you could try an over the counter formula from Whole Foods for candida overgrowth. They are very effective but be cautioned that you can get a little worse for a few days and then the rash will start to disappear.

Started cephalexin today 250mg. Experiencing extreme sweating, lots of gas. Burping a lot, and tightness of chest. Doctor said to stop and try again tmrw. Insane sweating. Don't know if this is normal.

I took this med for an ear infection... I wish I had read this first.. I had a reaction like yours I made it through five doses and couldn't stand the pain... Thought it would get better... Swelled up badly in the vaginal area!!! Ended up with yeast infection... Now after I month another yeast infection... Is this still due to the meds? I never have yeast infections. What is up? How much longer?

This medication was prescribed to my dog for a urine tract infection, she has a known blood disorder called vanwillebrand factor, this medication caused her to bleed excessively and was diagnosed by the ER vet. This medication cost me the stress of thinking my dog was going to bleed to death, a trip to the emergency vet hospital on a Friday night, and an extra $467.00 vet bill.

I also just experienced a cold sore outbreak after one day on cephalexin. It was prescribed for a stye on my upper eye lid. I am going to stop taking it. I will rely on the ophthalmologist to incise and drain it if it's still there by my appointment. The cephalexin was not prescribed by the ophthalmologist, but rather by a doctor I know personally who thought it would help. I'll stick with the warm compresses and then go to the eye doctor's if needed.

I took keflex after a c-section. After about two days I developed a hoarse voice, a cough and intermittent sweating. On the third day (I was actually AT the hospital visiting my baby in the NICU, thank God) I started projectile vomiting all over, broke out in hives and began having trouble breathing.

A nurse wheeled me down to the ER and by the time I got there my throat was closing up. I received IV epinephrine, benadryl, steroids, and an albuterol treatment and was okay. The reaction kept coming back to a lesser extreme for about a week. (Coughing, diarrhea, upset stomach) I took Benadryl and Albuterol to help with it.

I started taking cephalexin almost a week ago. I had diarrhea and I had a cluster of little white blisters form on my labia. I'm pretty sure I'm std free but I am going to get tested again. Has this happened to anyone else?

I was given Keflex when I had my wisdom teeth pulled 9 months ago and I broke out in rashy sores all over my body. It has scarred me all over my waist and legs and I am still lightly breaking out. I have also had itchy hives every day since taking it, serious stomach pain and I cant always get my breath. I have been to the doctor several times and he doesn't think its related but can't say either way really and I don't have the money to keep going back trying to figure it out. I don't know what to do from here.

Beware

I have not had any rashes yet... thank god... but the Dr prescribed it to me for 4 times a day (which seems very high) to me... every morning, actually every time I take it I am getting severely nauseous and want to instantly throw up wherever I am at.. I went and got it for tonsilidous but it isn't even helping.. well my throat is not as sore, but sorry for being gross... my phlegm is still yellow and green. My last visit the Dr prescribed me a whole extra dose of antibiotics so I'd have extra but those didn't even work... just so happened I had the same Dr who prescribed me 4 doses in a day of Keflex...

I called pharmacy and they said the normal dose they see on average is 2-3 tops a day.. makes me think the Dr just wants to make money by prescribing more meds!

People's Pharmacy response: The doctor's reimbursement is not at all dependent on the dose or even the number of medications prescribed, so that's not the motivation. That doesn't mean the antibiotic you have gotten is right for you; we can't determine that.

I started taking this medicine 5 days ago after having surgery to my ankle. I am COMPLETELY exhausted. Has anyone else had this
symptom?

I have been on 4 different antibiotics for a infection in my fingers, which the doctors "think" is candida. I can't understand being on something that causes yeast infections for yeast infection! One of them I had a severe reaction to and had to discontinue. When getting to the end of my prescription of Cephalexin I developed a rash, swelling & itching in my genital area.

The Dr has now prescribed fluconazole for it. I have started sit baths of melaleuca products and am taking probiotics. Is fluconazole a safe product to take for these symptoms? Thanks

I took Cefalexin 500 mg for two three 3days. I has itching at my back and feels so exhausted. Had terrible sore throat. Stopped taking it.

I was prescribed Cephalexin 500mg 3x a day for a sinus/ear infection. It is day 4 on the drug, and I have intense nausea, dizziness, diarrhea, an itchy rash on my chest, and cannot sleep. I have quit taking the drug; how long will these symptoms last!?

I started taking Kelflex on October 20th (500mg 4x day) to treat and prevent recurrence of a staph infection in my surgical wound (umbilical hernia repair). I am supposed to keep taking it until the wound heals "from the inside out" (skin needs to grow and fill in the gap where the hernia sac previously occupied. The wound isn't completely healed yet, so I am still taking Keflex.

About a week ago, I started getting a generalized itching all over my body. I thought it was an allergic reaction to something I ate last Saturday/Sunday. But now the itchiness is nearly unbearable, and if it was allergic reaction to food it should be fading if not gone. Has anyone else had the all-over-itchiness-rash after being on the drug for 6 or more weeks?

I am seeing my surgeon for my next follow up on Tuesday, but I am wondering should I try to get in to see my dermatologist too. I tried taking Benadryl today and the first dose seemed to work, but when it wore off and I took more it didn't seem to alleviate the itching at all.

Keflex is not working for me. 2000MG a day prescribed by a dentist to fight an infection - it's not working to kill the infection that's for sure. No side effects other than its destroying my stomach lining- which I would gladly live with for a short while if the medication WORKED.

I started cephalexin [500mg twice a day] three days ago, I do believe I've taken it before and didn't notice any side effects, but this time I have bad dry skin on my hands, mostly my right, its not itchy but its scaly and uncomfortable...

My doctor diagnosed me with Impetigo on Friday on my face (around my mouth) and a spot on my arm. The next day it had spread to my eye so I went to the walk in. She prescribed me with Fucidin cream to put on the sores as well as Cephalexin pills to take (2 capsules 4 times a day). I do not have a rash anywhere (couple of dot on chest could be pimples from sweating at night) but my chest feels really tight and I feel like I'm having a bit of difficulty getting a good deep breathe not sure if its because of the Cephalexin or not. Might go to the ER if it continues, my eye is still very red and swollen. Hopefully this will go away, although I am reading a lot of scary side effects from this antibiotic.

has it gone away, is it an allergic reaction the the cephalexin ?

I also was given Cephalexin 500 mg for an infection after a burn on my leg.
My side effects are tiny little blisters everywhere which itch like crazy. I stopped the medication, that is after 5 days before I connected the medication and the itching. Now a week later I am still developing new rashes and itching. How long will that last after stopping the medication?

It took about 3 months of prednisone to completely clear. I now carry a wallet card advising not to give me this drug. My Doctor and Pharmacist are also aware. The drug worked great for my infection but the rash and internal bleeding were too high a price.

Within a few hours of taking this drug, my foot began to swell and blister. Stopped taking immediately. A couple of days later skin began to peel on foot. 2 1/2 months later, I still have a couple of fairly deep wounds that are not healing properly. Anyone experience similar outcomes and what did you do?

I was given this for my illness because I'm pregnant and can't take what I am normally given. I'm allergic to penicillin, but I haven't taken it since I was like 2. Within minutes of taking my first dose, I began having issues breathing. I can only describe the feeling as being like a panic attack.

I thought it was my illness until taking the second dose, when these effects came back. I also felt extremely confused, disoriented, and weak. My fever seemed to get worse, and I thought I was going to collapse at any second. This has also given me the first yeast infection I've had in my life. I won't be taking this ever again. I'm not even finishing this prescription. All this took was two doses!

So I have been sick since probably August. It started with flu and sinus like symptoms. I home medicated with thera-flu alka seltzer, tylenol cold and sinus you name it I was trying it. I had my tonsils and adenoids taken out back in 1998 and was in my late 20's. I have had problems with my sinuses since.

Usually the doctors would just give me Guaifenessan 500 MG and I could take a couple of days and I would be better. Well then thera-flu came out and it has 500 mg of the Guaifenessan in it, so I was just able to take it when I could feel a sinus infection coming on. NOT this time nothing worked so I finally went to doctor around November she didn't even really check me and put me on 10 days of Cipopro, not better so went to different doctor (was not happy with the first one she was a nurse practitioner and my doctor did not have time to see me) anyway so this other doctor tells me I didn't have a sinus infection that It was bacterial so he puts me on Keflex 500 mg. 3 times a day.

So I take it and along with it still having to take Excedrin because the headaches are still kinda there. Oh forgot to mention that (I have excruciating headaches when I get sinus infections so that is why I thought that is what I had.) But these headaches have been different. Took the course of meds and while taking I ended up with an infection between two of my lower teeth on my gums.

So now I'm thinking maybe a bad tooth is causing the problem. Go to dentist they check me out nothing except they think I need 2 root canals, and proceeds to give me another prescription for Keflex so I don't run out before I can see an oral surgeon. I get a second opinion in the mean time I had ran out of the second prescription and pain came back tooth infection gone so I start third round of Kefles 500 Mg 4 times a day until I can get second opinion.

2nd dentist says I don't need a root canal I did have a bad wisdom tooth and a couple of teeth that needed filled. So he done the work. Thought everything was fine wrong after about 2 weeks meds were done they wore off back again headaches so they put me back on Keflex oh and forgot to mention vicodin same dose as before. They send me to a Maxillofacial specialist he says I have tmj and also wants me to see an ENT specialist. And asked me to run out of meds again and see what happens after doing treatments for tmj. I do 8 days later headaches back and on another round of 500 Mg of Keflex. Waiting to see ENT specialist.

Now I am starting to cramp in my stomach and the headaches are coming back while I'm on the keflex still not as bad but there also have noticed pain in my joints of my arms and legs starting. ANY THOUGHTS OUT THERE? I'm desperate I know this cant be good for my body. :(

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