MedDataToolViagra is a medication used to treat erectile dysfunction, which is the inability to achieve or maintain an erection. It works by increasing blood flow to the penis during sexual stimulation, helping to produce an erection. Most patients start with a dose of 50 mg taken about an hour before sexual activity, but it can be taken anywhere from 30 minutes to 4 hours prior, with a maximum dose of 100 mg and a limit of once per day. It's important to know that Viagra should not be taken with nitrates, which are medications often used for chest pain, as this can cause a dangerous drop in blood pressure. Additionally, older adults or those with severe kidney or liver problems may need a lower starting dose of 25 mg due to increased sensitivity to the medication.
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Uses
- erectile dysfunction.
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Dosage
Take 50 mg about 1 hour before sexual activity.
Can be taken 30 minutes to 4 hours before sexual activity.
Maximum dose can be adjusted between 25 mg and 100 mg.
Do not take more than once a day.
Can be taken with or without food.
Always follow your doctor's specific instructions for your dose.
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Side effects
Common
Common side effects include headacheflushingand upset stomachOther common effects are nasal congestionback painand dizziness
Serious
Serious side effects can include prolonged erection and sudden hearing lossSeek immediate medical help for chest pain or severe dizziness
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Warnings
⚠ Important warnings
- Do not take with nitrates or nitric oxide donors.
- Use caution if taking alpha-blockers; start with a lower dose.
- Elderly patients and those with liver or kidney issues may need lower doses.
- May cause low blood pressure when combined with certain medications.
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Drug interactions
- Nitratescan cause dangerously low blood pressureCaution
- Alpha-blockersmay increase blood pressure-lowering effectsCaution
- Ritonavirlimit dose to 25 mg within 48 hoursCaution
- Erythromycinincreases sildenafil levels significantlyMonitor
- Ketoconazolemay increase sildenafil levels.Caution
Ask about this drug
Answers pulled from the FDA label only.
Medical Disclaimer: This content is provided for informational and educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before taking any medication.
Data Source: Publicly available drug labeling information from the U.S. Food and Drug Administration (FDA).
Data Source: Publicly available drug labeling information from the U.S. Food and Drug Administration (FDA).