Potential Eye Health Concerns Tied to Popular Erectile Dysfunction Medication
A recent study has uncovered a connection between prolonged tadalafil use and a heightened risk of glaucoma among men over 40. Researchers analyzed medical records of nearly 74,000 men, revealing that those who regularly took tadalafil faced a greater likelihood of developing glaucoma and elevated intraocular pressure. This extensive analysis utilized data from the TriNetX Analytics Network, spanning 21 countries. The study compared 37,000 men who had taken tadalafil for at least three months with an equal number who had not used similar treatments.
Within five years, glaucoma was diagnosed in 3.93% of tadalafil users compared to 3.16% in the control group. This corresponds to a 22% relative increase in glaucoma risk among tadalafil users, equating to about 77 additional cases per 10,000 men. Additionally, these men were roughly 30% more likely to experience high eye pressure or primary open-angle glaucoma. Tadalafil is commonly prescribed not only for erectile dysfunction but also for urinary difficulties related to enlarged prostate.
How Tadalafil’s Mechanism Might Impact Eye Health
Tadalafil and sildenafil (Viagra) both inhibit the enzyme phosphodiesterase type 5 (PDE5), which promotes blood vessel dilation. PDE5 is also present in eye tissues, suggesting a potential link to glaucoma risk. One hypothesis is that tadalafil may increase the production of aqueous humor—the fluid inside the eye—thereby raising intraocular pressure. However, this study was observational and cannot definitively establish that tadalafil causes glaucoma. The diagnosis data relied on medical coding rather than direct measurements of eye pressure.
It’s also possible that men taking tadalafil visited doctors more frequently, which could influence the diagnosis rates. Experts recommend that patients, especially those with glaucoma or a family history of the disease, monitor their eye health regularly but should not stop taking tadalafil without consulting their healthcare provider. The findings were published on July 28, 2026, in the British Journal of Ophthalmology. The study serves as a general reference and does not replace professional medical advice.
This research highlights the need for cautious use of erectile dysfunction medications, particularly in older men. While the association between tadalafil and glaucoma is notable, further studies are required to confirm whether tadalafil directly contributes to the condition. Men using these treatments should maintain regular eye examinations and discuss any concerns about risks with their doctors.