(DAILY MAIL) — The active drug in Viagra has been linked to 19 deaths in the UK last year, the highest on record since 1999.

Sildenafil, the active drug in Viagra, caused more than a dozen deaths in 2017 and is currently linked to seven fatalities this year, according to a report by the Medicines & Healthcare products Regulatory Agency (MHRA).

A majority of the deaths were caused by cardiac problems, including coronary artery disorder, cardiac arrhythmia and heart failure.