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Do antibiotics affect plan b

A 18-year-old female asked:
Dr. Susan Albow
Integrative Medicine 22 years experience
Plan B: Plan B works through delaying or preventing ovulation, by interfering with fertilization. The FDA package insert also states that Plan B may inhibit i... Read More
Dr. Heidi Fowler
Psychiatry 25 years experience
Most antibiotics: are ok. Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), Rifampin, tetracycline, & clarithromycin.

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A member asked:
Dr. Lynne Weixel
Clinical Psychology 36 years experience
Should be fine!: There is ONLY one antibiotic that affects BC. It's for tuberculosis - Rifadin (rifampin). Otherwise ther's no impact in either direction. Best! http:/... Read More
A 47-year-old member asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Most are not: effected. Antibiotics which can affect Plan B include ampicillin, cotrimoxazole (in Bactrim), tetracycline, & clarithromycin.
A 17-year-old female asked:
Dr. Gurmukh Singh
Pathology 49 years experience
Effective: Plan B is very effective but not 100 %. 3 hour window will not alter the effectiveness of the treatment. If you wish to be sure, you may get an IUD pl... Read More
A 35-year-old male asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Possibly: Antibiotics which can affect Plan B: ampicillin, cotrimoxazole (in Bactrim), tetracycline, & clarithromycin.
A 22-year-old female asked:
Dr. Tanya Russo
Pediatrics 25 years experience
Yes: Antibiotics should not interfere with the efficacy of Plan B.
A member asked:
Dr. John Berryman
Obstetrics and Gynecology 54 years experience
"Plan B": Some antibiotics can interfere with absorption of oral birth control (Plan B for example), but not enough to reduce the hormonal effect on the uterine... Read More
A member asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Agree W Dr. Khanna: This shoulde be fine. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregn... Read More
A 20-year-old female asked:
Dr. Jeff Livingston
Obstetrics and Gynecology 22 years experience
No: You already took Plan B and it works immediately. Starting antibiotics now will not affect it.
A 24-year-old female asked:
Dr. Paul Garrett
Radiology 40 years experience
Low Risk of Preg.: There is a drug interaction of Zithromax and Oral contraceptives: http://www.rxlist.com/drug-interactions/azithromycin-oral-and-estradiol-norethindron... Read More

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