Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e. Do not take other medicines unless they have been discussed with your doctor. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. Do not keep outdated medicine or medicine no longer needed. Take sildenafil as needed before sexual activity. Do not use more of it and do not use it more often than your doctor ordered.If you have these symptoms, stop taking VIAGRA and contact a doctor right away. have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve, or heart failure. have had heart surgery within the last 6 months. have pulmonary hypertension. have had a stroke. If you’re prescribed Viagra, you can purchase it in doses of 25, 50, or milligrams (mg). Hims recommends taking Viagra anywhere from 30 minutes to 4 hours before sexual activity.  · The effects may be increased because of slower removal of the medicine from the body. Leukemia (blood related cancer) or. Multiple myeloma (blood related cancer) or. Sickle-cell anemia (blood disorder)—Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur.

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