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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does Taking Antibiotics Affect Birth Control?

Have been on depo prevera shot for three years and just recently got a urinary tract infection. Was taking sulfameth/trimethoprim for antibiotics. I took.two a day for three days and had sex with my partner Saturday and took my last antibiotic on Friday. We did not use a condom and I was just curious to know if my antibiotics have affected my birth control?
Mon, 1 Aug 2016
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General & Family Physician,  's  Response
hello dear .
understand your concern.
yes some drugs like ampicillin,barbiturates,sulfonamides,etc...interfere with deposhot function. So as you took sufonamide there may be chance of decrease in effectiveness. These type of antibiotcs decrease re circulation of hormone/progesterone in body or increase breakdown/increase metabolism of hormone in the liver result in decrease effectiveness
Sometime illness and Antibiotics affect the hormonal levels and affect the function depo shot.
AS both antibiotic and illness disturbs the hormone level, there may be chance of menstrual irregularity.
But not in all case it affects the effectiveness of contraception.
I advice you to wait for period to come. IF period will delay by 10-12 days then GO FOR PREGNANCY CONFIRMATION BY URINE PREGNANCY TEST AND OR BLOOD HCG to rule out the pregnancy. If you will bec ome pregnant still you can terminate by using abortion pill under the advice of gynaecologist.

hope this will guide you.
best regards.
dr.sagar
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Does Taking Antibiotics Affect Birth Control?

hello dear . understand your concern. yes some drugs like ampicillin,barbiturates,sulfonamides,etc...interfere with deposhot function. So as you took sufonamide there may be chance of decrease in effectiveness. These type of antibiotcs decrease re circulation of hormone/progesterone in body or increase breakdown/increase metabolism of hormone in the liver result in decrease effectiveness Sometime illness and Antibiotics affect the hormonal levels and affect the function depo shot. AS both antibiotic and illness disturbs the hormone level, there may be chance of menstrual irregularity. But not in all case it affects the effectiveness of contraception. I advice you to wait for period to come. IF period will delay by 10-12 days then GO FOR PREGNANCY CONFIRMATION BY URINE PREGNANCY TEST AND OR BLOOD HCG to rule out the pregnancy. If you will bec ome pregnant still you can terminate by using abortion pill under the advice of gynaecologist. hope this will guide you. best regards. dr.sagar