He is 20 so we aren't that young but anyway thanks for the advice!
Hi,
Is it all right to ask how old your boyfriend is ?
Problems with sexual response such as failure to ejaculate and inability to reach orgasm may be due to underlying psychological factors.With regards to the allergy medications, I am not certain if this has any direct effect on your boyfriend's condition.Nevertheless, an organic cause still has to be ruled out. An assessment of the prostate and a neurologic examination to evaluate any nerve deficits in the groin area may help.
I suggest that he seek consult with a urologist.He may also benefit from a sex therapist and counselling sessions with a clinical psychologist or psychiatrist.