which antibiotics can effect birth control?

Question

Ok so about 3 days ago my boyfriend and I had unprotected sex and he went inside of me. I've been on birth control for about 8 months now. Then 2 days after we had sex I got put on antibiotics for 10 days to treat a sinus infection. could I be pregnant even though I started antibiotics after and have been taking my birth control like I should?

Answer 1

These antibiotics interact and make the pill less effective:

rifampin (brand name Rifadin)
penicillin (Veetids)
amoxicillin (Amoxil)
ampicillin (Omnipen)
sulfamethoxazole/trimethoprim (Septra or Bactrim)
tetracycline (Sumycin)
minocycline (Minocin)
metronidazole (Flagyl)
nitrofurantoin (Macrobid or Macrodantin)

Use a condom if you're taking an antibiotic!

Answer 2

1

Answer 3

Does Sulfamethoxazole Affect Birth Control

Answer 4

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RE:
which antibiotics can effect birth control?
Ok so about 3 days ago my boyfriend and I had unprotected sex and he went inside of me. I've been on birth control for about 8 months now. Then 2 days after we had sex I got put on antibiotics for 10 days to treat a sinus infection. could I be pregnant even though I started antibiotics after...

Answer 5

There are two ways that antibiotics potentially can reduce the action of birth control pills. Birth control pills contain estrogens. Some antibiotics, e.g., rifampin, griseofulvin, cause the enzymes in the liver to increase the break-down of estrogens and thereby can decrease the levels of estrogens in the body and the effectiveness of the pills. This can result in unwanted pregnancy. Therefore, individuals taking birth control pills should use a second method of birth control when taking these antibiotics or other drugs that can increase the break-down of estrogens.

The other way that antibiotics could interfere with the effectiveness of birth control pills is by reducing the re-circulation of estrogens within the body. Estrogens, e.g., ethinyl estradiol, in birth control pills are broken-down by conversion in the liver to other chemicals which are then secreted into the intestines in the bile that is produced by the liver. Bacteria in the intestine are able to convert these chemicals back into the active estrogen which is then reabsorbed into the body.. This re-circulation is called entero-hepatic cycling. Theoretically, antibiotics can kill the bacteria that convert the inactive chemicals to the active estrogen, and, therefore, may interfere with the effectiveness of birth control pills. Unwanted pregnancies could occur. Although it has not been proven that unwanted pregnancies can occur by this means, drug manufacturers caution that antibiotics could decrease the effectiveness of birth control pills. Since it is better to be safe than sorry, individuals taking birth control pills are advised to use a second reliable method of birth control when taking antibiotics.

Answer 6

Well the reason why birth control pills are effective is because they stop ovulation and also thicken cervical mucus, so no offense to the first answer, but that is inaccurate. If you have been on birth control pills regularly you would not be ovulating. Certain antibiotics do lower the effectiveness of birth control pills but they don't completely stop them from working. I know for sure amoxicillin and penicllin are one of those antibiotics. It does increase your chances of your contraceptives failing, but not significantly. Especailly if youve been taking them
everyday like you should, it probably won't. Even if you had stopped taking your birth control, it takes most women at least a couple of months off the birth control pills to get pregnant bc your body has to adjust to going back to ovulating a little while after you stop.
If I were you I would just take a pregnancy test and tell your obgyn doctor your concerns. You probably aren't but just to it to relieve your anxiety.

Answer 7

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Yes - all antibiotics can make birth control less effective and doctors recommend a back-up plan such as condoms and spermicide if you aren't already using them. Continue with your birth control as usual too.

Answer 8

Pretty much any antibiotic can affect birth control. I would suggest using protection as well if you are on antibiotics and do not want to become pregnant.

Answer 9

All Antibiotics will interfere with your birth control and you'll just have to wait to see if your pregnant...Good Luck!!!!

Answer 10

All antibiotics can prevent birth control from working. You most definately could have gotten pregnant. Take a test when your period is due or first response is accurate 69% at 5 dys before your period is due.

Sperm can live up to 5 days inside the womb, so if you started antibiotics 2 days after sex, then you could have ovulated when you still had live sperm inside you.