zeebster (imported) wrote: Fri Sep 09, 2016 5:09 pm On the contrary, my investigation of the side effects of omeprazole as I've taken the drug for some time and gynecomastia is listed as a possible side effect.

I'll echo that. I've taken a daily 10mg omeprazole for years and this was raised recently to 2 x 20mg daily to tackle a persistent cough. I concede it may be coincidental, but within a few weeks I noticed swelling in my left breast which was scanned/diagnosed as gynecomastia. I'm trying to persuade my GP towards a prescription for tamoxifen...