Priligy, touted as the world's first drug to treat premature ejaculation, sold out just one month after its launch in Singapore.
The first batch of pills was made available in March and was meant to last three months.
But it was cleared out last month as demand was much higher than expected, said a spokesman for American-based manufacturer Janssen, a subsidiary of Johnson & Johnson.
However, the company declined to reveal the exact number of pills sold.
The pills, which come in packs of three and are prescription-only, have since been restocked. Patients are advised to take one pill one to three hours before sex, and no more than one a day.
Priligy works by increasing levels of serotonin, a chemical involved in controlling ejaculation.
While it is said to triple the time a man can sustain an erection, it does not cure premature ejaculation.
A pack goes for between S$80 ($187) and S$90 (RM210), which means each pill costs as much as S$30 (RM70). This is comparable to other established sexual enhancement drugs like Viagra, which treats erectile dysfunction.