I have 5 inches penis when erect and 4 inches girth. do i have a small penis?

Endocrinologist or..: An endocrinologist, a urologist, or an adolescent medicine doctor all have experience with the normal development of boys to men... contact one for an examination. One concern is whether or not a person has low sex hormones. That said, a 5-inch penis may be normal, or may run in the family. If all else in life is normal, including sexual function, then a 5-inch penis should work fine.

Majority of men want to have penis larger than it is. Your penis is within normal range. There are all too many false claims of medications &/or procedures guaranteed to enlarge penis. There are more important things in life than penile size & right partner will accept you for what you are which is that you are normal guy.

Your size is normal and there is nothing you or anyone else can do to make it bigger. Do not waste your money and risk your health on fake medications. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.