The first question that comes to mind is how old are you? Do you have any heart related problems? What is your endurance level like?
Viagra is great for "expected sex". It was designed to work about 1 to 2 hours before sexual play. It does give you a great boost in your ability to maintain and deliver the goods, unfortunately not all who take it experience the positive benefits of it. It can cause headaches and a stuffy nose.
Cialis is geared to last up to and beyond 36 hours. It has the ability to keep up the goods but not for a long time. I have always looked at this drugs as tow opposite extremes. One is built for a major assault on the islands and the other as a long marathon with no intensity. Again, this may cause stuffy nose and a headache. However, if you drink plenty of water with your initial dose you may lessen the side effects. Remember this, the longer a drug is in your bloodstream the greater possibility of side effects. Cialis remains in the blood longer. I would only take it if Viagra does not work.
My advice is to try the viagra (50 mg) first. See how your body reacts to the drug. It may be enough to get the job done. Less is better. Taking more drug than what is needed only increases your chance of having a bad reaction and nothing is more disappointing than leaving your woman hanging because you have a raging headache and can't breathe, or in worst case scenario dropping to the ground clenching your chest due to pain.
If for some reason 50 mg does not do the job, ( which is unlikely ) then boost it to 100 mg. If you have 50 mg tablets then take two. It's better than purchasing 100 mg tabs and having to cut them in half. Besides 50mg tablets are cheaper and Pfizer has a viagra plan where they offer discount prices for 4 or 5 prescriptions.
Good Luck!!
Biochemgen