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Doctor insights on: How Long Until Cephalexin Works

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For how long is cephalexin capsule good for?

Duration of action?: The duration of action of Keflex is about 12 hours
the shelf life of Keflex is 2-3 years if stored well. ...Read more

Dr. Chad Levitt
289 Doctors shared insights

Keftabs (Definition)

Keftabs is a first generation cephalosporin which is a kind of cephalosporin type drug (anti-bacterial ...Read more


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Can you tell me how long does it take for 500mg cephalexin capsules to get out of your system?

Can you tell me how long does it take for 500mg cephalexin capsules to get out of your system?

Short half-life: Cephalexin has a short half-life, about an hour or maybe longer depending on the patient's kidney function. If you notice, you are supposed to take it multiple times a day -which is why... the body washes it out pretty quickly. Usually after about five times the half-life, the medicine is totally gone... so depending on 'when' you took your last dose, it should be out within a day. Hope that helps ...Read more

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Which probiotic works with keflex?

Which probiotic works with keflex?

Any: Probiotics in theory would work with any antibiotic. It are independent fsctors. Probiotics will try restore or maintain flora & GI environment. As well as try keep an anti oxidant balance ...Read more

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WHAT IS THE LONG TERM SIDE EFFECTS OF TAKING NITROFURITOIN AND CEPHALEXIN TOGETHER?

WHAT IS THE LONG TERM SIDE EFFECTS OF TAKING NITROFURITOIN AND CEPHALEXIN TOGETHER?

Probably safe: It is unusual to require both these antibiotics at the same time. Confirm with the prescribing doctor (s) that both are needed. However, if needed, they should not interact: there are no known increased side effects from taking both at once. ...Read more

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I stopped taking cephalexin, but I'm still getting the side effects. How long will these last?

More info: If you tell us the specific side effects you are experiencing we are more likely to be able to provide a helpful answer. Consider resubmitting with clarification. ...Read more

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How long will it take cephalexin 500mg to work for treating an infection?

How long will it take cephalexin 500mg to work for treating an infection?

Cepahlaxin: If the infection is a susceptible strain, it will take a few days to a week or so depnding where and how bad the infection is. ...Read more

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Went back to dr for folliculitis and he gave me another 10 day dose of cephalexin how long does it take to heal and how do you know if it is healing?

Went back to dr for folliculitis and he gave me another 10 day dose of cephalexin how long does it take to heal and how do you know if it is healing?

Maybe: The time varies. The real question is did it get better with the cephalexin or not. If it did, then you just need more time. If it did not, then maybe you are on the wrong antibiotic. ...Read more

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What strength (in billions) probiotic should I take while being on Keflex and Batrim? How do I look for one that actually works? Any Recommendations?

What strength (in billions) probiotic should I take while being on Keflex and Batrim? How do I look for one that actually works? Any Recommendations?

Probiotics: The highest quality probiotics will be found in the refrigerated section of the health food store. They will be in capsule or liquid forms. Look for one with a variety of strains. Employees or owners of these types of stores will likely be well educated regarding the products they sell and should be able to guide you towards the best choice. ...Read more

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How to store antibiotics for long term? I have cephalexin and amoxiclav. What best temperature to store?

How to store antibiotics for long term? I have cephalexin and amoxiclav. What best temperature to store?

Storing Medications: You want to keep them at room temperture protected from light. Although they do loos effect overtime and you really should take the prescribed course so there never should be left over antibiotics in a prescription. ...Read more

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How long do I need to take Cephalexin (Keflex) for a Uterine Infection?

How long do I need to take Cephalexin (Keflex) for a Uterine Infection?

What does the Rx say: What does the Rx say? Every Rx has a dosage, frequency of daily dosing, and a duration of use. Your MD/s Rx. Will have that answer. ...Read more

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If what I have is staph infection after taking cephalexin 500mg tid how long would it take to clear up and how long should I take the cephalexin?

Staph infection: Your question cannot be answered without knowing what type of infection you have, the sensitivity of the organism, and whether it is in an area in which Cephalexin penetrates well. In addition it may be necessary to take this more than three times a day. Need far more info. ...Read more

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Taking Cephalexin for an open wound on my foot. Been taking for 17 days 3 times per day as prescribed but I'm nervous it's been too long on this?

Taking Cephalexin for an open wound on my foot. Been taking for 17 days 3 times per day as prescribed but I'm nervous it's been too long on this?

Osteomyelitis: I understand that you may feel that you have been on this antibiotic therapy for too long. I do not know the specifics of your case but my guess would be that your Dr is concerned that your foot wound infection has spread to your bone, this is called osteomyelitis. This would require more intense and prolonged antibiotic treatment. Get well soon! ...Read more

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How long does it take UTI symptoms of dementia like state in elderly to go away she is on ic cephalexin since Saturday?

How long does it take UTI symptoms of dementia like state in elderly to go away she is on ic cephalexin since Saturday?

Here are some. ..: The relevance of the contents in this Q is unclear, but my sifting through it suggests concerning her mental alteration possibly related with symptomatic UTI. If so, the duration of optimal recovery may widely vary in part because many elderlies are taking tranquilizers / antidepresents. Besides they have multiple concomitant medical issues. So, it's hard to blame UTI as sole cause of such change ...Read more

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How long should you wait before getting fluid taken to look for MERSA if currently taking 7 days of Cephalexin 500 mg for a suspected staph infection?

How long should you wait before getting fluid taken to look for MERSA if currently taking 7 days of Cephalexin 500 mg for a suspected staph infection?

MRSA: MRSA is a common skin infection that is treated with oral antibiotics. If an abscess is present, surgical drainage is required. In nearly all cases, we do not re-test as the response is judged clinically--how the area looks. If someone does not appear to be responding (less redness, less swelling, no drainage), then a re-evaluation is made. ...Read more

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How long until I see the effects of prednisone for an allergic reaction to cephalexin, severe rash?

How long until I see the effects of prednisone for an allergic reaction to cephalexin, severe rash?

A few days: You should start seeing improvement hopefully within a few days. Using a topical steroid cream with the oral steroid can also help quicken recovery. If it is not improving, let your physician know. ...Read more

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I am a female, 40's, taking 250 mg of cephalexin for over 5 years 1x daily for cystic acne with probiotic. Should I be concerned with long term use?

I am a female, 40's, taking 250 mg of cephalexin for over 5 years 1x daily for cystic acne with probiotic. Should I be concerned with long term use?

I would: Antibiotics tend to lose effectiveness with time due to bacteria developing resistance to it. You don't mention how effective it's been for you, so more information in that direction may be helpful as well. Probiotic supplement is a must with the use of antibiotic, whether short or long term, but you may ask your derm doc if there are other options available in this day and age. ...Read more

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7f on cephalexin for 3dys and still has enlarged tonsils and feels enlarge under chin. How long does it take to go bk to normal after a positivestrep?

7f on cephalexin for 3dys and still has enlarged tonsils and feels enlarge under chin. How long does it take to go bk to normal after a positivestrep?

3-4 days: Most individuals with streptococcal pharyngitis usually appear to recover in 3-4 days. Cephalexin is an appropriate choice for this infection. If no improvement and you feel enlargement under the chin, I would be worried about tonsillopharyngeal cellulitis or abscess formation and would recommend to see the PCP. ...Read more

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Ciprodex &cephalexin 4 severe ear infection...24 hours later and still in unbearable pain....can't function...how long till kicks in how can I ease it?

Ciprodex &cephalexin 4 severe ear infection...24 hours later and still in unbearable pain....can't function...how long till kicks in how can I ease it?

It may take time: It seems you are being treated for Otitis Externa which can be really painful and it may take more than 24 hours may be 3to 5 days for it to control your pain. You can take over the counter pain med like Ibuprofen or Tylenol (acetaminophen) if no allergy or other contraindication. Or call your doctor and get prescription Analgesic.. ...Read more

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I have allergic reaction from antibiotic cephalexin. What is the best antihistamine and how long will it take to clear up, also now have swollen face?

I have allergic reaction from antibiotic cephalexin. What is the best antihistamine and how long will it take to clear up, also now have swollen face?

Have you been seen?: This is an urgent situation. Hopefully, you have been seen by a physician. If not, proceed to the ER if the swelling involves the mouth (potential for progression to throat and breathing incapacity). If you are improved, then an urgent visit in the morning (or Virtual Consult) is recommended for prednisone (for phenomenon of delayed reaction). Cetirizine 10mg twice a day if no contraindications ...Read more

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My 14 yr old son is going to start taking 500 mg of cephalexin twice a day for acne. Is it safe to take this for a long period of time?

My 14 yr old son is going to start taking 500 mg of cephalexin twice a day for acne. Is it safe to take this for a long period of time?

It is safe: This regimen is safe if properly managed by the prescribing doctor. Your dermatologist selected this particular antibiotic for a clinical reason, & his/her recommendations should be followed. Cephalexin is often used for pustular acne that tests positive for staph or for acne that has been resistant to the typical antibiotic, tetracycline, which can be contraindicated in an immature 14 year old ...Read more

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Derm rx'd 1000mg cephalexin for acne, 3mo supply. Are there long term effects of taking antibiotics for that long or longer?

Derm rx'd 1000mg cephalexin for acne, 3mo supply. Are there long term effects of taking antibiotics for that long or longer?

Yes: Determining risk vs benefit is what we do every day for every patient we prescribe treatments or recommend even an Aspirin a day... ...Read more

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My question is in regards to my acne. I was prescribed cephalexin & prednisone, how long does it take for the medicine to start working? The first few days I broke out ALOT even in my forehead (my problem was only in my jawline/cheeks).

My question is in regards to my acne. I was prescribed cephalexin & prednisone, how long does it take for the medicine to start working? The first few days I broke out ALOT even in my forehead (my problem was only in my jawline/cheeks).

Acne????: You are not describing a treatment for acne. Ask the Dr what is the diagnosis. Probably you need a dermatologist. Is is unusual and often inappropriate to use both prednisone and cephalosporin at the same time. ...Read more

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How long for cellulitis of the hand (spread to mid wrist) 2 heal for a patient w a weakened immune system? Caused by blown vein post-IV. On cephalexin

How long for cellulitis of the hand (spread to mid wrist) 2 heal for a patient w a weakened immune system? Caused by blown vein post-IV. On cephalexin

TimeHealsAllWounds: Hard to say. Depends on the severity of the infection, whether the infection had extended inside the vein, the degree of your immunosuppression and the susceptibility of the infection to the cephalexin.Healing tends to be slower at first then accelerate as healing progresses. But for a very general ballpark estimate for you, expect the majority to heal over 2 weeks, then more over the next 1-2 weeks. ...Read more

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I'm taking keflex isit OK tohave a few beers. Today is my last day taking them...? How long should Iwait

I'm taking keflex isit OK tohave a few beers. Today is my last day taking them...? How long should Iwait

Exercise caution: Alcohol, in general, is not the drug I would like to have on board if I have an infection - even low levels can impair our immune response, both in terms of white blood cells that gobble up bacteria and viruses, and the production of antibodies to kill the invaders. One or two beers is unlikely to cause many problems, but would keep in mind also that safe drinking is 1 beer/d in women, 2/day men. ...Read more

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How long does keflex take to work?

How long does keflex take to work?

7-10 days: Antibiotics such as Keflex can work in 7-10 days sometimes shorter- it is important to complete the course of therapy prescribed for you in order to completely eradicate the infection. Symptoms often go away prior to completion- but take them all to avoid a repeat infection or a resistant infection which is much more difficult to treat. ...Read more

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What is the long term effect of taking keflex?

What is the long term effect of taking keflex?

Antibiotics: Taking antibiotics without prescription can have many bad effects. If prescribed for some reason discuss the alternatives, benefits and risks of long term therapy with your doctor. Sometimes depending on the condition treated the benefit outweights the risk. Sometimes its the other way around. ...Read more