I urinate for 15 to 20 minutes but after that urine drops come from my penis when i walk or press my penis i am very much tence please give me some medicine?

Need 2 see urologist: Urinating for 15 - 20 minutes is very prolonged ; abnormal ; most likely due a urethral stricture. This would also account for your post-void dribble. You probably need a retrograde urethrogram x-ray ; certainly cystoscopy. A very short structure (narrowing) can be corrected by optical urethrotomy followed by temporary catheterization till healed. Longer stricture requires open surgery. Good luck.