Before taking synthroid, I had a normal menstrual cycle. Two weeks after starting the drug and two weeks after having my cycle, I am on my period again. Could this be caused by the synthroid?
I recently was prescribed synthroid for hypothyroidism. Can it effect menstrual cycles?
- Asked
- 17 Mar 2010 by smackie3
- Updated
- 28 Mar 2010
- Topics
- synthroid, hypothyroidism, menstrual disorders
Responses (1)
Yes, quite possibly. Changes in menstrual periods is a commonly reported side-effect of Synthroid. Talk with your doctor if it is bothering you.

Further Information
- Synthroid Information for Consumers
- Synthroid Information for Healthcare Professionals (includes dosage details)
- Side Effects of Synthroid (detailed)
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