Some people buy tadalafil online without a prescription. Prolonged erections can be dangerous. Tell your doctor if any of these symptoms are severe or do not go away: headache. If you are taking tadalafil for erectile dysfunction on a regular schedule, take the missed dose as soon as you remember it. If you are already taking medication to treat BPH, your doctor may tell you to stop taking your other medication at least one day before starting treatment with tadalafil. Nitrates come as tablets, sublingual under the tongue tablets, sprays, patches, pastes, and ointments.Cialis was originally created and is produced by the pharmaceutical company Eli Lilly. Generic tadalafil became available in after the patent protection ended. What is Tadalafil (Cialis)? Drug Facts. Common Brands Cialis. Drug Class PDE-5 inhibitor. Controlled Substance Classification Not a controlled medication. Generic Status No lower-cost generic available. Availability Prescription only. How Tadalafil (Cialis) works. Tadalafil (Cialis) is a phosphodiesterase-5 enzyme (PDE-5) inhibitor. Eli Lilly and CompanyHIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use CIALIS safely and information for CIALIS. CIALIS (tadalafil) tablets, for oral use Initial U.S. Approval: INDICATIONS AND USAGE CIALIS is a phosphodiesterase 5 (PDE5) inhibitor indicated for the .

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