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Tadalafil raises glaucoma risk by 22%, British Ophthalmology study finds

8/24/2026

The case for tadalafil has long been clear: proven efficacy for erectile dysfunction and enlarged prostate symptoms, backed by decades of clinical use.

A study now published in the British Journal of Ophthalmology, covering nearly 74,000 men, complicates that picture.

Men who took the drug were 22% more likely to develop glaucoma than those who did not, surfacing a visual risk that patients rarely associate with the medication.

An international research team compared roughly 37,000 men prescribed tadalafil against a matched group not using phosphodiesterase type 5 inhibitors, the drug class that includes Eli Lilly's Cialis, following both cohorts for up to five years.

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