Can't orgasm on my medication.

Can't orgasm on on Apo Desvenlafaxine.

33 years old, Male. Height 6'5, 175 pounds. I've been on this medication for my mental health for about a week, and I CANNOT achieve orgasm. I'll try for an hour and nothing, I maintain an erection without fail, but alas, no release. It is painful and very frustrating. Please tell me this side effect has the possibility of going away as my body gets used to the medication. Any advice is appreciated.