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Can antihistamines cause lighter periods?

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General & Family Physician
Practicing since : 2005
Answered : 466 Questions
I am 32 and have been on the pill for 6 years. My most recent period was 2 days later than expected and very light, hardly anything and only lasted 1 and 1/2 days. At the time of my period I was regularly taking cold medication with antihistamines. I took a two pregnancy tests one three days after my light period and another 6 days after, both negative. Should I be concerned? Could the antihistamines make my period lighter? Could I be pregnant?
Sat, 5 May 2012 in Menstruation and Miscarriage
Answered by Dr. Mitaly 22 minutes later
Hi Vchristopher,

Thanks for posting your query

Antihistamines do not have any effect on the oral contraceptives and on the hormonal levels.

If you have been regular with contraceptive pill use regularly without missing a single one then chances of pregnancy are unlikely. However if you had taken antibiotic along with the birth pill then its efficacy can be decreased.

It seems that there might be some hormonal fluctuation which would have caused lighter period.

Hope I have answered your query. I will be available for follow up if any.

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