Genetic balding is it reversible in men?

Not reversible. Medications - Minoxidil (Rogaine) & Finasteride (Propecia), Surgical - Hair transplant. Eat a nutritious diet to avoid deficiencies. Avoid hairstyles that pull hair tightly. Use gentle shampoo. Avoid hair dryers, permanents or curling irons. Consider use of a wide toothed comb. Consider acupuncture. Genetics plays the biggest factor in balding for most people- you may or may not have success.
No. Male pattern baldness is not considered 'reversible.' Finasteride is a pill that can be prescribed by your doctor to stop the loss of hair. It will only work while you are taking it and if you stop taking it, you will start losing hair again.