There are studies that show the long term efficacy of these drugs. I'm not an expert, but I don't think they just stop working like that. I've been using Cialis for over a year with excellent results. And there are ways to improve your results:
a) Always take these drugs on an empty stomach
b) There are studies that show that vitamin E can increase the efficacy of these drugs
c) PDE-5 inhibitors are very effective but they only act locally and don't increase libido; if you're feeling depressed, anxious, etc. Viagra probably won't work. Viagra and Cialis are mere erection facilitators, not erection initiators
d) Cialis takes a long time to work, I always take it at least 3 hours before sex
e) I always take Cialis with Vigamed (oral phentolamine), another ED drug; both drugs work sinergistically. Vigamed is not available in the US but you can order it online: vasomaxclinic.com
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