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Doctor insights on: Z Pack Birth Control

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Will taking z pack after having unprotected sex affect the birth control I took prior to taking the zpack?

Will taking z pack after having unprotected sex affect the birth control I took prior to taking the zpack?

Risk minimal: Azithromycin may reduce the effectiveness of hormonal birth control tablets although the risk is small. To be safe it is recommended that another method of birth control (eg condoms) be used for the time you are taking the antibiotics and then for another 7 days. Check with your doctor if you are unsure. ...Read more

Azithromycin (Definition)

Azithromycin (zithromax, azithrocin, zmax, azin)[1] is an azalide, a subclass of macrolide antibiotics. Azithromycin is one of the world's best-selling antibiotics.[2][not in citation given (see discussion.)] it is derived from erythromycin, with a methyl-substituted nitrogen atom incorporated into the lactone ring, thus making ...Read more


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I'm On birth control and was on a z pack. I had un protected sex a week and a few days ago I've had spotting for the past 4 days what's going on?

I'm On birth control and was on a z pack. I had un protected sex a week and a few days ago I've had spotting for the past 4 days what's going on?

Antibiotics...: ...can decrease the effectiveness of your birth control pill, so pregnancy is possible. More likely the combination is causing some intermenstrual spotting. Keep taking your pill as directed, and see what happens as your period comes. ...Read more

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Will a z-pack alter the effects of my birth control pills? How about steroid shots?

Z-pak yes: A Z-pak alone can certainly interfere with bcp's. Use protection until the start of the next cycle. ...Read more

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Took a z-pack during my period week. Period ended the 27th, z-pack ended the 1st. Started normal birth control on the 28th. Had sex 4th. Pregnant?

Took a z-pack during my period week. Period ended the 27th, z-pack ended the 1st. Started normal birth control on the 28th. Had sex 4th. Pregnant?

Don't know: I had trouble tracking all this info. But one thing did stick out - if your started oral contraceptives on the 28th and then went on to have sex on the 4th (; it was not your period) then you were likely not protected. Some oral contraceptives need to be taken for a month before they are fully effective. Other contraceptives can be started on day #1 of period. Sounds like you didn't use backup. ...Read more

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Took azithromycin the first week of a new pack of birth control on the third week had sex without a condom was i protected?

Took azithromycin the first week of a new pack of birth control on the third week had sex without a condom was i protected?

No: The med was likely out of your system or at such a low level it would not protect you from a reinfection. Try using condoms if your active.It will not prevent all STD's but gives you at least partial protection.I hope you understand that chlamydia can go infect your Fallopian tubes and render you functionally sterile. ...Read more

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Should I take plan b if I had sex without a condom the third week of a new pack I took azithromycin in the first week of a new pack of birth control ?

Should I take plan b if I had sex without a condom the third week of a new pack 
I took azithromycin in the first week of a new pack of birth control ?

Not if on BC a while: A woman who takes birth control (BC) pills correctly, and is beyond her first pack of pills, has contraception (protection against pregnancy) every day. That means she can have sex every day, and not get pregnant. It means she has NO fertile days, as long as she takes the pills correctly. (Of course, any woman of child-bearing age, having sex, CAN get pregnant... the possibility is always there.) ...Read more

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Hi, do antibiotics such as cefuroxime axetil (ceftin) or the "Z-pak" (azithromyacin) affect Ocella (drospirenone and ethinyl estradiol) birth control's effectiveness??

Hi, do antibiotics such as cefuroxime axetil (ceftin) or the "Z-pak" (azithromyacin) affect Ocella (drospirenone and ethinyl estradiol) birth control's effectiveness??

Rare problem: The whole business about antibiotics interfering with hormonal contraceptives (pills, inserts, etc) is largely an urban myth. It can happen, but is very rare. Neither of these antibiotics taken as usual (a few days to a couple of weeks) is likely to be a problem, I wouldn't worry about it. But if you're nervous, also use condoms while taking them and for a week after the last dose. ...Read more

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Does Zithromax affect the birth control , Tri Sprintec?

Does Zithromax affect the birth control , Tri Sprintec?

Oral contraceptives : in general many antibiotics can decrease oral contraceptive efficacy and barrier contraception such as condoms should be used while taking antibiotics ...Read more

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What percentage chance is there that oral birth control will fail while taking azithromycin?

What percentage chance is there that oral birth control will fail while taking azithromycin?

About 5%: But if you don't want to be in the 5% use condoms.Bcp itself has a 3-5% failure rate so we recommend using condoms in addition all the time to prevent pregnancy. ...Read more

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I have been off azithromycin for 3 days will I still need to use a backup with my birth control?

I have been off azithromycin for 3 days will I still need to use a backup with my birth control?

Below: It is best to use backup method of BC along with your pill for the whole cycle during which you took the antibiotic.

Many think only broad spectrum antibiotics will decrease the effectiveness of BCPs.

However, using an additional method of BC during the current cycle will give you reassurance. ...Read more

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Im on sprintec birth control,I just finished 5 days of azithromycin will it effect it or will I need a backup for how long?

No to both questions: According to professional drug references, azithromycin does not affect how sprintec works, and Sprintec would be no more likely to fail in this case than it normally would, so you should not need a backup ...Read more

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Will azithromycin effect my birth control? Can I have unprotected sex?

Will azithromycin effect my birth control? Can I have unprotected sex?

Use a condom: Antibiotics can decrease the effectiveness of contraceptive pills, so use condoms this month or practice abstinence. You should not be having unprotected sex regardless, because birth control does not prevent sexually transmitted diseases. Good luck. ...Read more

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Hi. Does azithromycin affect the pill cerazette? I took 4 azithromycin 2 weeks ago and don't know how long this could impact on my birth control.

Hi. Does azithromycin affect the pill cerazette? I took 4 azithromycin 2 weeks ago and don't know how long this could impact on my birth control.

Antibiotics: As a general rule, all antibiotics have the potential to minimally decrease the effectiveness of birth control, so it best to simply use condoms as well when having sex while on them. Best wishes. ...Read more

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Does Azithromycin affect the effectiveness of the birth control pill, Chateal?

Does Azithromycin affect the effectiveness of the birth control pill, Chateal?

Possibly: most antibiotics can affect the contraceptive effectiveness of birth control pills, the best known for that are tetracyclines and ampicillins, so better be cautious and use an extra method for contraception while on an antibiotic, good luck ...Read more

Dr. Jeff Livingston
2,394 doctors shared insights

Contraception (Definition)

Contraceptiion is a means of preventing conception (or fertilization). There are hormonal and non hormonal methods of preventing sperm and egg from meeting. Talk to your doctor or clinic about what options are best for you. There are short acting methods (condoms, pills, patch, ring) and long ...Read more


Dr. Lonnie Smith
4 doctors shared insights

Birth Control (Definition)

Also known as contraception, birth control is a method to prevent pregnancy. Some methods of birth control include a vasectomy, tubal ligation, oral contraceptive pills, vaginal rings, hormone injections, condoms, diaphragms, sponges, ...Read more