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Doctor insights on: How Long Do Antibiotics Stay In Your System

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Dr. Michael Ein
Board Certified, Infectious Disease
43 years in practice
3M people helped
1

1
How long do antibiotics stay in your system after doses?

Dr. Michael Ein
Board Certified, Infectious Disease
43 years in practice
3M people helped
How long do antibiotics stay in your system after doses?

5 half lives: Various antibiotics have different half lives. A half life is the time it takes to excrete 1/2 of the drug present in the body. A drug is considered to have been totally eliminated after 5 half lives. Therefore find out the half life of the antibiotic you are interested in and multiply it by 5 and you will have the time it takes for that drug to be eliminated. ...Read more

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Dr. Jane van Dis
Board Certified
13 years in practice
44M people helped
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Dr. Jane van Dis
Board Certified
13 years in practice
44M people helped
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Dr. John Leander Po
1,118 doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more


Dr. Ryan Phasouk
Board Certified, Family Medicine
13 years in practice
4M people helped
2

2
How long do antibiotics stay in your system?

Dr. Ryan Phasouk
Board Certified, Family Medicine
13 years in practice
4M people helped
How long do antibiotics stay in your system?

Varies: The extent of time an antibiotic stays in your body would depend on which antibiotic you are taking as they will vary greatly. Ask a pharmacist for specifics. ...Read more

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Dr. Jane van Dis
Board Certified
13 years in practice
44M people helped
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Dr. Jane van Dis
Board Certified
13 years in practice
44M people helped
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Dr. Harold Fields
Board Certified, Family Medicine
56 years in practice
1M people helped
3

3
How long do antibiotics for food poisoning stay in your system for?

Dr. Harold Fields
Board Certified, Family Medicine
56 years in practice
1M people helped
How long do antibiotics for food poisoning stay in your system for?

Antibiotics: It depends on the half life of the antibiotic but i would think that they would be all clear in 72 hours. ...Read more

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Dr. Ryan Phasouk
Board Certified, Family Medicine
13 years in practice
4M people helped
4

4
How long should antibiotics stay in your system?

Dr. Ryan Phasouk
Board Certified, Family Medicine
13 years in practice
4M people helped
How long should antibiotics stay in your system?

Varies: The extent of time an antibiotic stays in your body would depend on which antibiotic you are taking as they will vary greatly. That is why timing and dosages of medications can vary. Ask a pharmacist for specific antibiotic questions you may have. ...Read more

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Dr. Jane van Dis
Board Certified
13 years in practice
44M people helped
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Dr. Anatoly Belilovsky
Board Certified, Pediatrics
30 years in practice
6M people helped
5

5
How long does an antibiotic stay in your system for?

Dr. Anatoly Belilovsky
Board Certified, Pediatrics
30 years in practice
6M people helped
How long does an antibiotic stay in your system for?

Depends.: Half-life of penicillin is a couple of hours; that of Azithromycin - several days. Other meds are in between. ...Read more

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Dr. Anatoly Belilovsky
Board Certified, Pediatrics
30 years in practice
6M people helped
6

6
How long does an antibiotic stay in your system after you have taken the last of it?

Dr. Anatoly Belilovsky
Board Certified, Pediatrics
30 years in practice
6M people helped
How long does an antibiotic stay in your system after you have taken the last of it?

Depends.: Half-life of penicillin is a couple of hours; that of Azithromycin - several days. Other meds are in between. ...Read more

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Dr. Joseph Shen
Board Certified, Cardiac Electrophysiology
26 years in practice
1M people helped
7

7
How long does the antibiotic tacozin stay in your system. After a week of IV treatment? Thanks!

Dr. Joseph Shen
Board Certified, Cardiac Electrophysiology
26 years in practice
1M people helped
How long does the antibiotic tacozin stay in your system. After a week of IV treatment? Thanks!

Hmmm: Following single or multiple doses of piperacillin / tazobactam to healthy subjects, the plasma half-life of piperacillin and tazobactam ranged from 0.7 to 1.2 hours and was unaffected by dose or duration of infusion. The elimination half-lives of both piperacillin and tazobactam are increased with decreasing renal clearance. ...Read more

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Dr. STEPHEN GIROUX
Board Certified, Pharmacology
35 years in practice
421K people helped
8

8
How long does it take for antibiotics like clarithromycin and amoxicillin stay in your system for?

Dr. STEPHEN GIROUX
Board Certified, Pharmacology
35 years in practice
421K people helped
How long does it take for antibiotics like clarithromycin and amoxicillin stay in your system for?

Just a few days: Antibiotics typically need to be used for 7=14 days to allow your body defenses to overcome an infection. They will typically stay in your system for a few days after completing treatment. Always important to take the entire course of treatment prescribed to assure complete eradication of the infection and to prevent a resistant infection from developing. ...Read more

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Dr. Kathleen Mullane
Board Certified, Internal Medicine
27 years in practice
594K people helped
9

9
I recently finished an antibiotic about a week ago. How long does it stay in your system and how long can it affect my birth control?

Dr. Kathleen Mullane
Board Certified, Internal Medicine
27 years in practice
594K people helped
I recently finished an antibiotic about a week ago. How long does it stay in your system and how long can it affect my birth control?

Elimination issue: That depends on the antibiotic. Usually we say that it takes 5 half lives of the antibiotic to get out of the body. More importantly, the effect on your normal gut bacteria; can be altered > 1 month depending on how broad spectrum the antibiotic. Flora helps ocp absorption. It would be safest to at least use a secondary mode of protection for a month after you complete your course of antibiotic. ...Read more

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Dr. Lonna Larsh
Board Certified, Family Medicine
25 years in practice
11M people helped
10

10
How long does the antibiotic "metronidazole" stay in your system?

Dr. Lonna Larsh
Board Certified, Family Medicine
25 years in practice
11M people helped
How long does the antibiotic "metronidazole" stay in your system?

About 2 days: The half life of Metronidazole is 8 hours. It takes about 5 half lives for a substance to be almost entirely out of your body, so that's 40 hours for metronidazole. ...Read more

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Dr. Jane van Dis
Board Certified,
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