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·have heart problems such as angina, heart failure, irregular heartbeats, or have had a heart attack. Ask your doctor if it is safe for you to have sexual activity.
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·have low blood pressure or have high blood pressure that is not controlled
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·have had a stroke
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·have liver problems
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·have kidney problems or require dialysis
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·have retinitis pigmentosa, a rare genetic (runs in families) eye disease
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·have stomach ulcers
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·have a bleeding problem
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·have a deformed penis shape or Peyronie’s disease
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·have had an erection that lasted more than 4 hours
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·have blood cell problems such as sickle cell anemia, multiple myeloma, or leukemia
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·medicines called nitrates (See "What important information should you know about CIALIS?")
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·medicines called alpha blockers. These include Hytrinâ (terazosin), Flomaxâ (tamsulosin), Carduraâ (doxazosin), Minipressâ (prazosin) or Uroxatralâ (alfuzosin).
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·ritonavir (Norvirâ) or indinavir (Crixivan®)
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·ketoconazole or itraconazole (such as Nizoralâor Sporanoxâ)
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·erythromycin
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·other medicines or treatments for ED
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