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Priapism must be treated as soon as possible or lasting damage can happen to your penis, including the inability to have erections. Ask your healthcare provider or pharmacist if you are not sure if any of your medicines are nitrates or guanylatecyclase stimulators, such as riociguat. Do not take CIALIS if you take any medicines called "nitrates." Nitrates are commonly used to treat angina.Angina is a symptom of heart disease and can cause pain in your chest, jaw, or down your arm. CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with certain other medicines. Never take CIALIS with any nitrate orguanylate cyclase stimulator medicines. Read this important information before you start taking CIALIS and each time you get a refill.

The initial dosing is 2.5mg once daily, which can be increased to 5mg if the initial dosing is ineffective. If, after taking Cialis, Tadalafil, or any other ED drug, you find yourself with a painful erection for 4 hours or more, seek urgent medical advice. You may be suffering from Priapism