There is a thriving black market for Viagra
Spanish police say they have detained a man suspected of robbing 10 pharmacies at gunpoint, taking their money and all available boxes of Viagra.
Police in Madrid began receiving reports of the thefts in January.
Victims said the "only objective" of the lone gunman was to take boxes of Viagra and cash.
The authorities suspect the 43-year-old man of selling the pills on the black market, where they are sought by users for recreational purposes.
Combined with the illegal drug Ecstasy, the anti-impotence pill is well known on the club scene as Sexstasy.
Viagra manufacturer Pfizer warns the drug should not be taken unless recommended by a doctor.