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Some illegal “street” drugs called “poppers” such as amyl nitrate, butyl nitrate, or nitrite. The combination can cause a dangerous fall in your blood pressure. It is important to tell your doctor about any heart problems you have now or may have had in the past. Children—Use is not recommended. Do not take it more than once a day.Si vous ressentez une perte soudaine de l’ouïe, parfois accompagnée de bourdonnements d’oreilles ou d’étourdissements, pendant que vous prenez du Sildénafil, appelez votre médecin immédiatement. Le Sildénafil . Sildenafil tablets for pulmonary hypertension come in 10mg and 20mg strengths. The usual adult dose is 20mg taken 3 times a day. Doses for children can range from 10mg to 20mg taken 3 times a day, depending on their weight. Do not take it more than 3 times a day. Sildenafilo (Viagra). Este medicamento funciona mejor cuando lo tomas con el estómago vacío una hora antes de tener relaciones sexuales. El cuerpo demora más en absorberlo después de ingerir una comida alta en grasas o de consumir alcohol. Sus efectos suelen durar entre 4 y 5 horas, o más si tienes disfunción eréctil de leve a .