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how long do antibotics last

A 34-year-old member asked:
Dr. Anatoly Belilovsky
35 years experience Pediatrics
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 21-year-old female asked:
Dr. Saul Hymes
15 years experience Pediatric Infectious Disease
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 oft ... Read More
A 26-year-old female asked:
Dr. Robert Uyeda
45 years experience General Surgery
Assuming that: Your doctor found a bacterial colitis and he is treating you for it with antibiotics, you should be seeing improvement after one week. If you are not ... Read More
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A 41-year-old member asked:
Dr. Gregory Mosolf
25 years experience Pediatrics
Depends: If the diagnosis is correct and you have a bacterial conjunctivitis then the eye drops should work pretty quickly (24 to 48 hours). If it is actually ... Read More
A 30-year-old member asked:
Dr. Barbara Stark Baxter
42 years experience Allergy and Immunology
Antibiotic allergy: Antibiotic allergies can clear up in a day or last up to six months. Fortunately, most resolve relatively quickly, over a few days. We do not yet know ... Read More
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A 37-year-old member asked:
Dr. Tracy Sinha
53 years experience Allergy and Immunology
Varies: Depands on 1/2 life and can be lnger.
A 36-year-old female asked:
Dr. Bryan Levey
27 years experience Pediatrics
It could...: ...Be sore for several days.
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A 24-year-old male asked:
Dr. Nili Azhar
Specializes in Internal Medicine
Yes: all antibiotics can cause various forms of GI upset. They also change the balance of bacteria/micro organisms in the GI tract which can cause symptoms ... Read More
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A 36-year-old female asked:
Dr. Clarene Cress
Specializes in Pediatrics
OK to breastfeed now: According to the Academy of Pediatrics, ciprofloxacin is listed as a medication that is usually compatible with breast feeding. The half life of the ... Read More
A 29-year-old female asked:
Dr. Mirella Mircescu
A Verified Doctor answered
A US doctor answered Learn more
Strep: Usually 48 h or so unless there is an abscess or complications. If not resolved over the weekend see your PCP.

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