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Study after study shows that there are no clinically significant drug interactions* between the vast majority of antibiotics and the Birth Control pill. Anecdotal evidence from health care providers has led some to recommend using a backup method of birth control for a week after using antibiotics. Long-term use (as for acne) does not increase the risk of pregnancy. There are a few antibiotics, such as rifampin and griseofulvin and some HIV medications, that do interact. The safest approach is to check with your health care provider or pharmacist for advice specific to your situation.

*While some antibiotics may slightly change the absorption of estrogen in the gut, these changes are not enough to change how well the birth control pill works, with the exceptions noted above.

Taken from the newsletter: "Pharmacist's Letter" November 11, 2002

TRUTH:

Women have been warned for decades to use backup contraception when taking oral contraceptives and antibiotics together.

This all started back in the '70s when a few women on oral contraceptives took rifampin and then got pregnant.

Additional anecdotal reports started popping up, suggesting that other antibiotics might be related to unwanted pregnancies in women taking oral contraceptives.

One theory was that antibiotics killed gut bacteria, which are involved in estrogen absorption.

Researchers later discovered that rifampin and griseofulvin actually increase the metabolism of oral contraceptives, making them less effective.

But the evidence for other antibiotics is shaky.

In fact, oral contraceptive levels are not DECREASED by most antibiotics...tetracycline, doxycycline, ampicillin, quinolones, and metronidazole.

Oral contraceptive levels are actually INCREASED by some antibiotics...erythromycin...clarithromycin...and trimethoprim-sulfamethoxazole.

There's growing evidence that most women taking antibiotics with oral contraceptives do NOT have an increased risk of getting pregnant.

But most package inserts still warn that another form of contraception is needed when starting antibiotics.

Explain to women taking oral contraceptives that there can be up to a 3% failure rate, regardless of antibiotic use.

A small number of women might be predisposed to a higher failure rate due to genetic metabolic variations...but it's difficult to determine who these women are.

To be on the safe side, tell women to continue using backup contraception during the entire course of antibiotics and for 7 days after.

Explain that sickness or antibiotic side effects such as diarrhea or vomiting can increase oral contraceptive failure.

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8y ago
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Wiki User

10y ago

although it is not 100% correct to assume that all antibiotics decrease the effectiveness, some women have gotten pregnant when taking antibiotics. there is a warning on all antibiotics however stating that they may decrease the effectiveness of oral contraceptives. and all oral contraceptives come with a drug sheet that says the same thing about antibiotics. most ppl dont read them. that is why it is wise to have a back up plan: use a condem.
REVISION:

Antibiotics DO affect your birth control. My husband is a pharmacist, so I have this on good authority. The birth control is ineffective for the time you are on the antibiotics and most pharmacists recommend that you have a back up contraception for the entire month. If you had unprotected sex while on antibiotics you are at risk of pregnancy. You can call your local pharmacy and ask to speak to a pharmacist; they specialize in drug interactions.

First Answer:

Antibiotics should not interfere with birth control pills.

Antibiotics kill off germs. (Might even kill of sperm, depending on which antibiotic it is.)

Antibiotics should not interfere with hormones and you should be safe.

In my opinion there should be no need to take the morning after pill.

Extra information due to revision:

Controversial Opinions

Many doctors---according to mayoclinic.com---are not sure about the effects of antibiotics on birth control pills. Some doctors believe that the idea of antibiotics decreasing birth control effectiveness is overstated. However, others believe that a back-up birth control method should be used when on antibiotics.

The only antibiotic found (according to my quite extensive research on the internet) that actually pose as a proven real threat regarding birth control pills is: Rifampin and derivatives thereof.

This "group" of antibiotics are rarely used in the US and mainly towards infections of Tuberculosis.

There is a difference between opinion and factual research. An opinion is often based on statistics where as factual research deals with facts regarding the actual issue.

Clinical research says that antibiotics may pose as a factor but not likely as a threat at all. Birth control pills work two ways. (ovulation and egg attaching). Even if one does not work properly due to antibiotics, the other should.

Have a look at related links to learn more.

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Wiki User

14y ago

In most cases, no it doesn't. But, to ensure that you don't get pregnant; you should discuss this with your primary healthcare provider because it can depend on the type of birth-control that you are taking.

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8y ago

Amoxicillin and other antibiotics can make the BCPs less effective. Most suggest a barrier method like condoms.

Because our bodies are all so different there is no real way to measure this. What is enough to cause one woman to get pregnant may not have an effect on another.

Microorganisms in your gut can alter the drug, it gets sent back to the liver, which changes it back, and the cycle starts over meanwhile the drug is effective. If you take antibiotics you have the potential of killing those little helpful organisms, and enhance the clearance of the drug from the body.

There is insufficient evidence to say that amoxicillin negatively affects your birth control pills. The topic is debatable (though most experts believe that it does not) so most doctors err on the side of caution and instruct their patients to use other means of contraception.

In simple English there is no evidence that amoxicillin, tetracycline, penicillin or other broad spectrum antibiotics decrease the effectiveness of oral contraceptives. There are a few drugs that can have a marked effect on contraceptives so always ask your doctor or pharmacist when you begin taking a new prescription along with contraceptives.

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Wiki User

8y ago

As far as I know, all antibiotics lower the effectiveness of birth control. Just use a back up or don't have sex until a few days after you have stopped taking Vantin.

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Wiki User

11y ago

No, valacylovir (Valtrex), famcyclovir (Famvir), and acyclovir (Zovirax) do not affect the birth control pill.

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Wiki User

12y ago

There are no drug interactions between vaginal antibiotic creams and birth control pills.

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Wiki User

16y ago

No Viagra doesn't effect BCP.

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