Answer:
If by penis enlargement pills you mean what is considered "natural male enhancement pills", i would not suggest it unless disgusted with your physician first. i would like to point out that these products dont directly increase penis size like you've been told, they have to potential to increase sexual energy, sexual recovery, and the intensity of orgasm.
The main active ingredient in these pills is commonly Yohimbine, a drug which increases blood flow and is used for erectile dysfunction. Another ingredient likely to be in it would be ginseng. Ginseng has been reported to increase sexual stamina.
On the product a disclaimer will probably be listed telling you not to take it unless your eighteen years old, but unless you have current medical conditions it's generally safe.