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A 30-year-old member asked:

how long does an antibiotic stay in your system for?

1 doctor answer2 doctors weighed in
Dr. Anatoly Belilovsky
Pediatrics 35 years experience
Depends.: Half-life of penicillin is a couple of hours; that of Azithromycin - several days. Other meds are in between.

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A member asked:

What should I do if my baby takes antibiotics and throws up immediately?

3 doctor answers6 doctors weighed in
Dr. Scott J. Wolfson
Pediatrics 22 years experience
Try again: If she vomits immediately following dosing you may try to give the dose again. If any time has passed, 15-30 minutes or more since administration of the medication, i generally do not recommend giving the dose again. If she vomits after the second attempt, contact your pediatrician.
A member asked:

How do doctors determine antibiotic dosages for babies?

4 doctor answers10 doctors weighed in
Dr. Anatoly Belilovsky
Pediatrics 35 years experience
Per kilo body weight: Most antibiotics have dosages by milligrams per kilo body weight per day; amoxicillin, for example, is 40-100 mg/kg/day, so an 11-pound (5-kilo) baby would get up to 500 mg per day, usually in 2 doses, so that's 250 mg twice a day, maximum.
A 37-year-old member asked:

Can one experience withdrawal from an anti-biotic?

1 doctor answer1 doctor weighed in
Dr. Romanth Waghmarae
Pain Management 39 years experience
Antibiotic: No - withdrawal is usually seen with opioid or illicit substance use.
A 34-year-old member asked:

How long does an antibiotic stay in your system after you have taken the last of it?

1 doctor answer1 doctor weighed in
Dr. Anatoly Belilovsky
Pediatrics 35 years experience
Depends.: Half-life of penicillin is a couple of hours; that of Azithromycin - several days. Other meds are in between.
Fort Worth, TX
A 21-year-old female asked:

I took my last antibiotic pill today. How long does the medicine stay in the system and gone completely?

1 doctor answer1 doctor weighed in
Dr. Saul Hymes
Pediatric Infectious Disease 15 years experience
Couple days: Most medications clear within about four dose-lengths. So if you were taking it every 12 hours, by 48 hours it's gone. Shorter if it was dosed mor often, longer if it was dosed less often.

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Last updated Feb 28, 2020

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