Any interactions for 16 yr old girl taking 20mg prozac, 4mg cyproheptadine and omeprazole 40mg. Her dose of Prozac just went up to 20. 4 days on?

Yes, there's. an interaction between prozac and cyproheptadine, better hold the latter and ask your prescriber for an alternative, if it is really needed. Good that you asked, always exercise caution with multiple medications.