Sildenafil Interactions: What You Should Know

Drug, food, and alcohol interactions that affect Viagra (sildenafil) safety and effectiveness.

Quick Summary

Sildenafil can interact with several medications and substances. Some combinations may cause dangerous drops in blood pressure or reduce effectiveness.

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Major Drug Interactions

Contraindicated

Nitrates (Dangerous Combination)

  • Nitroglycerin
  • Isosorbide mononitrate
  • Isosorbide dinitrate

Risk: Severe drop in blood pressure

High Risk

Alpha-blockers

  • Tamsulosin
  • Doxazosin
  • Terazosin

Risk: Dizziness, hypotension

Other Medication Interactions

Food & Alcohol

Food

High-Fat Meals

Can delay absorption and onset but does not eliminate effectiveness.

Alcohol

Alcohol Consumption

May increase dizziness, hypotension, and reduce erectile performance.

Safety Guidelines

FAQ

Heavy meals, alcohol, and certain medications may delay absorption or weaken sildenafil’s effect.

Alcohol may reduce effectiveness and increase the risk of dizziness or low blood pressure.

High-fat meals may slow absorption and delay onset, making sildenafil feel weaker or slower.

Some supplements may influence blood pressure or absorption; interactions vary by product.

Combining ED medications is generally avoided due to increased risk of side effects and unpredictable response.

Yes. Taking sildenafil too soon after heavy meals or alcohol may reduce its effect or delay onset.

Some interactions may shorten duration or weaken the overall response, depending on timing and absorption.

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