If your dose is different, do not change it unless your doctor tells you to do so. Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. Some medications should not be taken with sildenafil. Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. You take it about 20 minutes before sex and get ready to rock!Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. COMMENT Thailand has approved an affordable generic version of the anti-impotence drug Viagra to go on sale next week, as the country looks to combat rampant counterfeit . In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take up to 4 hours to start.
