Sildenafil or other phosphodiesterase type 5 inhibitors are subject to counterfeit.
Reasons for counterfeiting these drugs or buying from shadow markets:
(1) expensive
(2) in demand
(3) requires a doctor's visit and prescription
Risk factors for exposure:
(1) buying drugs online
(2) poorly regulated stores in developing countries
Hazards of using counterfeit ED drugs:
(1) failure of desired effect
(2) misinterpretation of lack of effect as worsening condition
(3) harmful contaminants or additives
(4) presence of undeclared pharmaceuticals with potential for drug-drug interactions and adverse drug effects
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Specialty: Pharmacology, clinical
