31. Premarin contains some of these estrogens.32. The FDA in May refused to approve the Duramed product as a generic alternative to Premarin . 33. Panel members said Evista didn't appear as effective as Premarin in building bone density. 34. One study revealed that Premarin helps stop tooth loss in women, a symptom of osteoporosis. 35. -- Premarin , used for estrogen replacement, rose to $ 208 from $ 186. 36. Ayerst followed suit, with the introduction of Premarin ( conjugated equine estrogens ) in 1941. 37. Premarin replaced Emmenin due to the fact that it was easier and less expensive to produce.38. Premarin was introduced by Ayerst in 194139. The other estrogens were labeled biproducts or impurities, and the agency limited their presence in Premarin . 40. The other estrogens were labeled byproducts or impurities, and the agency limited their presence in Premarin .
