Medication for ulnar nerve entrapment? does it cure on its own ? its been 4 days tsince im experiencing numbness in my pinky and ring finger of right hand uptil my elbow

No medication: There is no medication that helps nerve entrapements. This sounds like a cubital tunnel which is a pinched nerve in the elbow. You can try an elbow brace at night which keeps you elbow straight which takes the pressure off the nerve.

Cubital tunnel: Inflammation and compression of the ulnar nerve around the elbow can cause numbness/tingling in the ring and small fingers. This is called cubital tunnel syndrome and is treated with oral/injectable steroids, nsaid's, therapy. It is also important to avoid extreme elbow flexion and pressure on the inside part of the elbow. See a board certified orthopaedic hand surgeon for treatment./surgery.