According to Pfizer, the questionable batches of Viracept contained an unusually high level of the compound ethyl methanesulfonate, or EMS, a suspected human carcinogen. 据辉瑞公司称,遭质疑的几批奈非那韦的甲基磺酸乙酯或EMS(一种可疑的人类致癌物质)超标。
Pfizer and the FDA have also issued interim prescribing guidelines for Viracept. 辉瑞和FDA也制定了奈非那韦的暂定处方指南。
The company said that while Viracept should be continued in children already doing well on the drug, it should not be started on new patients until further notice. 该公司称,那些使用该药有效的儿童应继续使用奈非那韦,但在进一步的通知出来前,不应再用于新患者。
Since then, the FDA has asked Pfizer to test batches of Viracept made for the U. 之后,FDA要求辉瑞公司检测美国市场的几批奈非那韦。