Men with heart conditions, particularly those with unstable angina, recent heart attack, or uncontrolled high blood pressure, should avoid Viagra. The drug can place extra strain on the heart, potentially triggering adverse events.
Similarly, individuals with low blood pressure should exercise caution. Viagra can further lower blood pressure, leading to dizziness or fainting. Close monitoring by a physician is necessary.
Patients with severe liver or kidney disease must also avoid Viagra. These organs process the medication; impaired function can lead to a dangerous buildup of the drug in the body.
Men with retinitis pigmentosa, a rare inherited eye disease, are at increased risk of vision problems with Viagra use and should not take it.
A history of stroke or bleeding disorders also contraindicates Viagra use, as it may increase the risk of bleeding events.
Finally, Viagra is unsuitable for those with a known allergy to sildenafil or any of its components. Severe allergic reactions, including anaphylaxis, are possible.
