Try Arginmax, it actually has a published study on its effectiness versus placebo. The ingredients seem safer also.

One recent article on Arginmax.

It should be mentioned that the published study in question looked at a small group of people and covered a 4-week period.
The individual ingredients (ginkgo, ginseng, damiana and L-arginine (a common amino acid found in food) could probably be found more cheaply on an individual basis, than in the name brand supplement.

Yes, I had a side effect - constipation. Actually, that was the only effect that I had. That certainly did not enhance my libido.