rickets is a nutritional disorder that can develop if you do not get enough vitamin d calcium or phosphate rickets leads to poor functioning of a bone s growth plate growing edge softened and weakened bones stunted growth and in severe cases skeletal deformities
Hence, a 20-year period of the patent usually gives manufacturers a chance to recoup the cost of developing a new drug. When a drug patent expires, any pharmaceutical company can manufacture and sell the drug. A drug, which is produced and distributed without patent protection is called a generic drug.
The expiration date on a drug is usually one to five years after it was manufactured. But those dates are often set arbitrarily, since the Food and Drug Administration doesnât require pharmaceutical makers to test how long the active ingredients will last, the researchers wrote.