Advice to consumers not to use the following herbal medicines used to treat erectile dysfunction

All herbal safety warnings and alerts

27 November 2012

The Canadian authorities have issued a warning not to use the following herbal products used to treat erectile dysfunction.

Product names:

  • Firminite; Extra Strength Instant Hot Rod; Libidron
  • Boost – Ultra Sexual Enhancement Formula; EreXite; Mojo Nights
  • Instant Hard Rod; RigiRx Plus; Zen Maxx
  • Vmaxx Rx


Reason for warning:

These products have been found to contain prescription medicines or unlicensed medicines  that are not declared on the product labels. Prescription medicines should only be taken under the supervision of a qualified health care practitioner.

Possible side effects:

These products have one or more of the following prescription medicines or unlicensed medicines: Tadalafil, Aminotadalafil, Sildenafil, Sulfoaildenafil, Hydroxyhiohomosildenafil.

Tadalafil is the active ingredient in a Prescription Only Medicine Cialis, and should only be used when prescribed by a doctor. Uncontrolled consumption of Tadalafil is dangerous and could potentially cause serious adverse reactions such as heart attack, stroke and severe hypotension.

Aminotadalafil is an analog of tadalifil (chemically related compound) which may interact with nitrates found in some prescription drugs.

Sildenafil is the active ingredient in Viagra and can cause potentially life-threatening high blood pressure. Individuals with heart problems are at increased risk of cardiovascular side-effects such as heart attack, stroke, chest pain and abnormal heart beat. Other side effects include headache, indigestion, dizziness and abnormal vision.

Sulfoaildenafil is an analog of Sildenafil (chemically related compound)

Hydroxythiohomosildenafil, is also an analog of Sildenafil, which can lower blood pressure to dangerous levels. Other side effects include headache, facial flushing, indigestion, dizziness, abnormal vision and hearing loss.

The side effects of the analogs of Tadalafil and Sildenafil are not fully known because they have not been subject to the stringent medicines testing process used for authorised medicinal products and it is not known if these ingredients are safe to use.

It is unclear whether these products are available in retail outlets in the UK but may be available on the internet.

Reporting problems with herbal medicines.

Health Canada (external link)

Page last modified: 27 November 2012