Men have been warned against buying just one brand of illegal sex supplements that could cause serious harm.

Australia’s drug regulator has warned people against taking certain erectile dysfunction pills that are illegal here.

The Panther Power Platinum 11000 and SWAG II Platinum 33K products pose a “serious risk” to health and should not be taken, the Therapeutic Goods Administration (TGA) said on Thursday.

The TGA tested the capsules and found an undeclared substance, sildenafil, contained inside.

Sildenafil is used to treat erectile dysfunction, a relatively common condition that can affect men of all ages.

However, it can interact with nitrates found in some prescription drugs and can lower blood pressure to dangerous levels, the TGA warned.

Nitrates are often prescribed for people with diabetes, high blood pressure, high cholesterol, or heart disease.

This follows similar warnings the regulator issued on Wednesday for 777K products and One Night Love tablets, which are also used to treat erectile dysfunction and illegal in Australia.

The TGA has advised people to stop using the capsules and take any leftover products to their local pharmacy for safe disposal.

“If you have used any of these products and have any concerns, consult your healthcare professional,” the regulator said.

“If you suspect a side effect (adverse event) from any product, please report to the TGA online or by phone at 1 800 020 653.”

The TGA has indicated that sildenafil is only available by prescription, which means that it poses a higher level of risk for those who take it.

In Australia, the advertising and supply of Panther Power Platinum 11000, SWAG II Platinum 33K, One Night Love and 777K tablets is illegal because the products have not been listed in the Australian Therapeutic Products Registry (ARTG).

Products sold online that are not listed in the ARTG and often do not require a medical prescription can be counterfeit, contain undeclared ingredients, and cause unexpected or serious side effects, the TGA said.

Lack of manufacturing and testing standards can also result in contaminated products.

The TGA said it was working with the Australian Border Force to prevent the products from entering the country.

“The ABF will seize and destroy the product when it is intercepted at the Australian border,” he warned.

Consumers wishing to treat erectile dysfunction are advised to consult their physician.