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Contact us for availability Details Product Name: Herivyl Drug Name: Phentolamine Mesylate Packaging Type: Packets of 4 x 40 mg Tablets Manufacturer: Libbs Pharmaceuticals Use: Herivyl can help to alleviate sexual dysfunction symptoms such as impotence, and ejaculatory failures. Herivyl works by directly or indirectly addressing the blood flow to the genitalia via several different biologic pathways. Two physiological systems, the sympathetic and the parasympathetic, play a role in sexual response. Herivyl controls the erection process through the body's sympathetic system allowing blood to flow into the penis to form an erection. How to take it: Dosage is usually one tablet approximately 20 mins before sexual intercourse. Do not exceed the recommended dosage by your doctor – this could cause serious complications. Side effects: Acute and prolonged hypotensive episodes, tachycardia, and cardiac arrhythmias have been reported. In addition, weakness, dizziness, flushing, orthostatic hypotension, nasal stuffiness, nausea, vomiting, and diarrhoea may occur. Precautions: If you have a history of cardiac problems, use this medication with caution. Your doctor may choose not to prescribe this medication if your medical history is not suitable for the side effects that may occur from taking Herivyl.