And now, years later, the FDA requires a generic drug to be identical in dosage, strength, quality and performance. Thank China for that since they sold us a bad batch of L-tryptophan in the early 90's. The only differences in drugs today are (sometimes) the labs they are created in, the trade names and cost. Why do you think Viagra spent so much money on their patent extensions? Trade name yields a lot more cash because of advertising. 25mgs of Sildenafi or 25mgs of Viagra is still 25mgs of Sildeafi.