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Hello,I am Dr. Aren and I will help with your query.Breast tenderness and breast enlargement are known side effects of the drug Finastride ,it would be prudent to stop this drug if such side effects are causing problems.Not every patient has this side effects,but persisting with the drug may cause further problem.A few patients have been reported to develop breast malignancy,it would be best to switch to some other drug.
It seems to be gynecomastia. You should have tamoxifen (10 to 20 mg/day) prescribed with finesteride.
Gynaecomastia is just another term for breast enlargement,stopping the causative drug would be a priority.