What's the problem when I don't get a erection after taking 100 mm Viagra what do I need to do to?

Viagra, Cialis, etc. do NOT produce erections. Those pills only help keep erections by inhibiting the PDE5 enzyme from breaking down chemicals that caused the erection. If you can't get or start an erection, it's likely these pills won't work. You must be aroused, then your body produces nitric oxide and other chemicals that result in an erection, and Viagra, etc. helps to maintain it.

After trying Viagra a few times, say 3-4, you can then try the others to see 2 - Cialis & Levitra. If you are buying these pills via the internet or without a prescription, the pills are likely Fake as Donald Trump. These pills cost about $65 each, and with or without insurance, somebody is incurring the cost.
Even "real" generic sildenafil citrate 100mg, available this week, is still $40/pill cash price.