"Viagra and two other popluar impotence drugs may cause sudden blindness in one eye in rare cases, the Food and Drug Administration said in a formal alert late last week"
ちなみに以下がCialisのDisclaimer。 CIALIS is not for everyone. If you take nitrates, often used for chest pain (angina), do not take CIALIS. This combination could cause a sudden, unsafe drop in blood pressure. Don't drink alcohol in excess (to a level of intoxication) with CIALIS. This combination may increase your chances of getting dizzy or lowering your blood pressure. CIALIS does not protect a man or his partner from sexually transmitted diseases, including HIV.
The most common side effects with CIALIS were headache and upset stomach. Backache or muscle ache were also reported, sometimes with delayed onset. Most men weren't bothered by the side effects enough to stop taking CIALIS. As with any ED tablet, in the rare event of an erection lasting more than 4 hours (priapism), seek immediate medical attention to avoid long-term injury. Discuss your medical conditions and medications, including alpha blockers prescribed for prostate problems or high blood pressure, with your doctor to ensure CIALIS is right for you and that you are healthy enough for sexual activity.
Individual results may vary. In clinical trials, CIALIS was shown to improve, up to 36 hours after dosing, the ability of men with ED to have a single successful intercourse attempt. CIALIS has not been studied for multiple sexual attempts per dose. もともとこんなにDisclaimerが長いんだったら、一行ぐらい「CIALIS may cause a serious ocular condition」って書いてもあんまかわらないような気もするけどね（ってそりゃいいすぎか）。
