Have tried Viagra and Cialis on prescrption because I have got diabetis.
Most people would say the same as me : - they both work really well but different. Viagra works in about an hour and lasts about 3-4 hours. Cialis works a bit quicker for me and lasts for at least two whole days. Theres not much point in taking cialis if you dont need the affects for all that time.
Side affects are same for both they can make you feel like you have a cold in your nose, they make your eyes go a bit weird with a blue light flashing (not that bad but I cant express it) and they make you red in the face and neck.- no problem in HK when its hot but a bit obvious if you are in UK winter! At first I got a headache too. The other side affect is that they make you last longer - spechally cialis. If you take lower doses you can reduce all the side affects spechally the funny blue lights and the stuffed up feeling. But I prefer herbal stuff now - the best Ive found is called Golden Root.