Zithromax and birth control pills?

 Category: Zithromax

Questions and Answers

The effect of Azithromycin (generic Zithromax) on the birth control pill?

I'm taking the antibiotic Azithromycin (generic Zithromax), how long so I have to use a birth control back up along with birth control pills after finishing up the five day pack of Azithromycin?

I don't know which birth control pill you are on ....but generally if you are taking a combined oral contraceptive, additional methods of birth control should be considered during and for at least one week beyond the last dose of short-term antimicrobial therapy.

You can do an interactions check by visiting the link below. Just put the name of the birth control pill you are on and azithromycin.


Will taking an antibiotic lower or completely diminish my combination birth control's effectiveness?

I am currently using Ortho Tri-Cyclen Lo, a popular low dose combination birth control pill. I have a sinus infection currently, which is definitely no fun, but my doctors are prescribing me a Z-Pack. While I've heard that taking rifampin - a certain type of antibiotic that isn't widely prescribed or used - clearly decreases the effectiveness of birth control pills (studies done to prove it, etc.), I am unsure if I should need to worry.

I read on a website that other antibiotics, particularly penicillin and tetracycline derivatives, could impair the effectiveness of birth control pills. However, I am unsure if zithromax / azithromycin is included in those two categories. Thanks in advance. :)

It states that any antibiotic can lower the effectiveness of your birth control pills and they advise you use a back up method.

Antibiotics and Birth Control?

I've been on the Birth Control Pill Sprintec for 2 months now. Yesterday was my last dose of the antibiotic, Zithromax (z pac). I took it for 5 days. My boyfriend and I had sex today. I'm on the last week of my bc pack. (i'm recently getting over my period) What are the chances of me getting pregnant?

You should take ur birth control for a full week following your antibiotics before having unprotected sex (so if u are on the placebo week, then it would be the full first week of the new pack). Antibiotics cause your pill effectiveness to decrease so the chances of becoming pregnant are higher. Since you just finished your period, I doubt that you would get pregnant though...

How long after taking zithromax will my Ortho Tri-Cyclen Lo be fully effective again?

I read online that the only clinical proof of antibiotics weakening the effectiveness of birth control pills was rifampin, though I am taking a 5 day course of Zithromax. I have read from different places that you are supposed to use backup methods of birth control for a week after your last dose, and some places that you are supposed to do so for a month after your last dose.

Is there any real conclusive medical study that shows when your birth control becomes effective again? I know I will probably get answers ranging from a week to a month in here, but any conclusive articles / studies / anything would be greatly appreciated.

I tell my patients who are taking antibiotics to use an additional form of contraception while taking the antibiotics and for an additional 7-10 days after that.

Please help.?

Does anyone know if the antibiotic zithromax affects the effectiveness of birth control pills?
Specifically zithromax?

Any antibiotic will decrease the effectiveness of your BC pills, if you have concerns call your doc.

Zithromax and Yaz?

I have been hearing conflicting stories as to the interaction with zithromax and the birth control yaz. Research is showing there has been no conclusive tests showing that antibiotics lessen the effect of birth control (b/c have not seen the antibiotic breaking down the pill). But my pharmacist said if your on the zithromax for five days, you should wait an additional 5 days before having sex and the ob/gyn said to wait until your next cycle before having sex without using additional protection. Can anyone clarify this??

You need to wait an additional 5 more days, but I would recommend checking with the package insert that came with your Yaz if you still have it because that can tell you for sure.

In the mean time here's the link to a site that may help you find more information:


Should I take another pregnancy test?

I had unprotected sex 11 days ago. He pulled it out before he ejaculated.. I am on birth control pills but REcently switched the time I take it from 5pm to 9pm. and I was on the antibiotics zithromax for 5 days where all of this happened. a day and a half later I took Plan B just to be safe. While I was still on the antibiotics though.
I took a pregnancy test and it came out negative, but im not sure if that would be accurate or not. Advice???

hi i would wait till your period has not come or you can test 5 days before your missed period hun because it has only been 11 days and it will not show up right now! but you should be safe

Do I need backup protection if I am taking Tri Sprintec (Ortho Tri-Cyclen generic), and Zithromax?

I started my Z-Pak on Monday for pneumonia. I finished it yesterday (Friday), and got my period today, so I started my new pill, for the first time ever.

I know some antibiotics interfere with birth control, so does Zithromax, or am I safe?

If I do have to use protection, how long do I need it for? Some people say Zithromax stays in your system longer than other antibiotics. I assumed I need it for a week, but I am also hearing I need protection for two weeks.


for the rest of your cycle.

How long should i use a backup method of BC when on antibiotics when two drs gave me two different answers?

about 5 months ago I was sick and was put on antibiotics. The dr at the time told me to use a back up method of birth control besides my pill for up to a week after my last antibiotic pill was taken. I did that, and didn't get pregnant. I started a new pack a few days into taking the antibiotic.

But this time, i got a different dr (i went both times to a walk in clinic) and he was going to give me one, then changed to Zithromax saying it was one of the safest, but to use a back up method until my next pill pack. well i START a new pack today, the same day ill be starting Zithromax, and he's telling me to be sure, to use a condom the entire month.

I don't understand why there is such a disagreement between doctors. So im not even sure what to do. I guess using a condom the entire month would be safest, but i wanted to know what others thought? im really confused.

The general advice goes as such- use protection during and for 7 days after finishing a course of antibiotics. If you finish the course in the last week you are on your pill before a break/placebo pills, start the next lot of active pills without a break. This is the British National Formulary Advice on antibiotics and the pill.

HOWEVER if you are starting to take an antibiotic you will be taking long-term (like oxytetracycline or doxycycline for your skin), use protection for the first THREE WEEKS you are on the antibiotics. After this, your gut bacteria will become resistant to it and you can go back to just using the pill.

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