The medicines regulator of Australia has warned its people against using herbal drug to treat erectile dysfunction available online.
The Therapeutic Goods Administration said although Natural Vigra VIAGRA tablets were marketed as being "100 per cent herbal", they contained the prescription-only drug, sildenafil, reports the Courier Mail.
In a statement posted on its website, the TGA said sildenafil may be harmful if taken without the supervision of a doctor, particularly in people with a history of cardiovascular disease.
It advised anyone using them to stop taking them and to discard the remaining tablets.
Sildenafil is the active ingredient in the approved impotency drug manufactured by pharmaceutical company Pfizer and available in Australia on prescription.
However, the TGA said the supply of Natural Vigra VIAGRA in the country was illegal.
It said the tablets had not been assessed by the TGA for quality, safety or effectiveness as required under Australian law.