Home › Guide · Updated November 9, 2026
How ED Medications Work: Timing, Food, Interactions and Combinations
This guide covers the practical side of ED medicine: what each drug must not be combined with, whether food changes how it works, what the labels say about taking two together, and how apomorphine differs by acting on the brain rather than on blood flow.
Start with interactions, the most important safety topic, then read the rest in any order.
Start here
- ED Medication Interactions: Nitrates, Alpha-Blockers, Alcohol and More
The interactions that rule ED drugs out, the ones that need a dose change, and the ones people forget to mention. Updated October 9, 2026
The medicines in practice
- Sildenafil Headache: How Common Is It?
Headache is the most common sildenafil side effect. The label's rates by dose, what else comes with it and when to call a doctor. Updated November 8, 2026 - Tadalafil With Alcohol: How Much Is Too Much?
Both tadalafil and alcohol widen blood vessels. What the label and the alcohol studies report, and where the caution starts. Updated November 6, 2026 - What Is Tadalafil Used For? The Three Approved Uses
Tadalafil has three approved uses: ED, an enlarged prostate and pulmonary arterial hypertension. Here is what each label says and what the trials measured. Updated November 5, 2026 - Tadalafil Brand Names: Which Brand Is Used for What
Cialis is the best-known tadalafil brand, but four others exist. What each FDA label says it treats, and why a brand name is not a dose guide. Updated November 4, 2026 - Sildenafil or Tadalafil: How the Two Drugs Differ
Half-life, food, enzyme selectivity and side effect rates for the two most prescribed ED drugs. Updated November 3, 2026 - Does Tadalafil Lower Blood Pressure? What the Label and Trials Report
Tadalafil lowers blood pressure a few points on average. The size depends on health, other medicines and alcohol. Updated November 2, 2026 - Tadalafil Doses: What the Label Says for As-Needed and Daily Use
Tadalafil is dosed two ways: 5, 10 or 20 mg as needed, or 2.5 or 5 mg every day. Here is how the label sets each and who gets a lower cap. Updated November 8, 2026 - Sildenafil Doses: How Much, and When the Label Says Less
Viagra comes in 25, 50 and 100 mg. Here is when the label advises starting at 25 mg: age, liver, kidneys, alpha-blockers and ritonavir. Updated October 31, 2026 - Generic Sildenafil: How It Compares With Viagra
What the FDA requires of a generic, the strengths on real labels and how generics differ from compounded products. Updated October 30, 2026 - Tadalafil Side Effects: Common, Serious and Long-Term
Headache, back pain and indigestion are the common tadalafil side effects. Here are the label rates by dose and the rare warnings that need care. Updated November 9, 2026 - Sildenafil 50 mg: What the Viagra Label and Studies Say
Sildenafil 50 mg is where the Viagra label starts most men. Here are the side effect rates by dose, the evidence and who starts lower. Updated October 28, 2026 - How Long Does Sildenafil Last? What the Label Says
The label gives a half-life of about 4 hours, not a promised duration. Here is what that means and what changes it. Updated October 27, 2026 - Tadalafil 10 mg: The Label Starting Dose and What It Means
Tadalafil 10 mg is where the Cialis label starts most men who take it as needed. Here is what the label and studies say about it, and who needs a lower ceiling. Updated October 26, 2026 - Tadalafil 20 mg: What the Label Says About the Highest ED Dose
Tadalafil 20 mg is the label's upper as-needed dose for ED. Here is how it compares with 10 mg and who needs a lower cap. Updated November 4, 2026 - Tadalafil 5 mg: What the Daily Dose Is For
Tadalafil 5 mg is built for once-a-day use. Here is what the Cialis label says about uses, trial results, side effects and who needs a different dose. Updated October 24, 2026 - Sildenafil 20 mg: Is It an ED Dose?
The 20 mg sildenafil tablet comes from a different label than Viagra. Here is what each label says and why the difference matters. Updated October 23, 2026 - Sildenafil With or Without Food? What the Labels Say
Food will not stop an ED pill, but a heavy meal can delay some of them. Here is the label detail for each drug. Updated October 22, 2026 - Best Medication for Performance Anxiety ED: What the Labels and Studies Show
No drug is proven for performance anxiety itself. Here is what the labels and studies say about the options for anxiety-linked ED. Updated October 20, 2026 - Sildenafil and Tadalafil Together: Labels and Evidence
Both labels say combining their drug with another ED treatment has not been studied. Here is what that means in practice. Updated October 20, 2026 - What Is Apomorphine? The Brain-Acting ED Drug, Explained
A dopamine agonist that acts on arousal rather than blood vessels, studied as a sublingual tablet for ED. Updated November 7, 2026
Every article in this guide is written by the Male Health Journal editorial team and cites its sources, mostly FDA labels, peer-reviewed studies and professional guidelines. How we work.