hi, thanks for writing.. dexedrine is brand name of the dextroamphetamine which is used in the treatment of ADD.which increases the attention. it acts by increasing the level of neurotransmitter dopamine which is also involved in regulation of sexual function by serotonin and prolactin.. due to high level of dopamine by dexedrine, the serotonin is lowered, which causes premature ejaculation and decrease sexual desire as well as poor erection also. because of the decrease sexual desire person does not go for sex or masturbation frequently, which causes involuntary leakage of semen or pre-ejaculation fluid. that is what happening to you.you shud consult your prescribing psychiatrist and tell your concerns related to sex and erection.. if possible ask for solution or for drugs those having minimal sexual side effects.. i hope this will b helpful to you..best of luck..