Your doctor may prescribe one of several selective serotonin reuptake inhibitors (SSRIs), such as sertraline (Zoloft), paroxetine (Paxil) or fluoxetine (Prozac), to help delay ejaculation.

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In addition to selling the once-a-week Prozac, Lilly has also re-branded fluoxetine, the active chemical in Prozac, to treat a serious form of premenstrual syndrome.

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For some, the illness is a medically treatable imbalance in brain neurochemistry a serotonin deficiency that can be remedied by selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine, better known as Prozac, which has been prescribed to more than 35m people worldwide since its launch in 1988.

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But instead of simply marketing Prozac to women with PMDD, Lilly has decided to launch fluoxetine hydrochloride, the chemical formerly known only as Prozac, as a brand-new drug called Sarafem.

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Barr will probably have exclusive rights to the generic fluoxetine, the chemical name for Prozac, for six months.

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The patent on the fluoxetine hydrochloride, the compound formerly known only as Prozac, runs out next year, and the patent on the process used to make it runs out in 2003.

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