Users of Viagra have reported a range of severe side effects, including hearing loss, flashing lights, and drooling, according to data collected by the Medicines and Healthcare products Regulatory Agency (MHRA) over the past five years. Other reported symptoms include blindness, hair loss, difficulty driving, swollen tongue, and confusion.

Since 2021, the MHRA has recorded 1,130 alleged adverse reactions linked to Viagra or its generic counterpart sildenafil. Headaches were the most frequently reported side effect, with 90 cases, followed by 34 instances of heart-related problems, including two fatal cardiac arrests. Six individuals reported that their hearing loss was connected to the medication, while two people associated the drug with the amputation of a leg.

One notable case cited involves the late Playboy founder Hugh Hefner, who reportedly experienced deafness in one ear after using Viagra but maintained that he preferred this side effect over losing his sexual function.

In total, 35 deaths potentially related to Viagra or sildenafil have been logged since 2021, but the MHRA emphasizes that none of the reported side effects have been definitively proven to result from the drug. The agency collects these reports through its Yellow Card scheme, which is designed to identify patterns in adverse reactions and enable timely warnings if necessary.

An MHRA spokesperson stated that when potential new side effects emerge, the agency carefully assesses the information and, if required, will implement measures to minimize risks to users.