There are several different medications on the market and your husband should be encouraged to try each of them (Levitra, Cialis, Viagra) as he may find one of them more favorable than the others. Some patients have had good success with the use of an aspirin along with the use of the oral agent and this may help prevent or decrease the headaches. Other alternatives may also be suitable for you husband such as drugs that can be injected directly into the penis, like Caverject. A surgical approach with a penile prosthesis may also be suitable. Lastly, you and your husband should consider counseling with a therapist who specializes in sexual dysfunction.