ED pills (and erectile dysfunction pills) usually mean prescription PDE5 inhibitors—sildenafil, tadalafil, vardenafil, and sometimes avanafil—not vitamin-aisle “male enhancement” packs. This page maps the class. Molecule buy language lives on the chapter pages. GenPharm XL does not sell tablets. You use this map to choose a path, then open one chapter.
Updated: 2026-10-19. Reviewed against Drugs.com’s ED medication list, Healthline’s ED medication list, SingleCare’s erectile dysfunction pills guide, and WebMD’s Cialis/Levitra/Viagra comparison by the GenPharm XL Formulary.
What ED pills means
You will see ED pills used as shorthand for oral medicines that treat erectile dysfunction. In US results that almost always means PDE5 inhibitors first.
Drugs.com’s condition list and Healthline’s medication list put labeled tablets at the top of the oral stack. SingleCare opens the same way: Viagra and Cialis sit in the PDE5 group among several treatment options. Short ed pills query? This chapter owns that object.
Injectables. Vacuum devices. Testosterone. Those are other ED tools. They are not “pills” in the same search sense. You stay on oral tablets here, then jump to compare or a molecule chapter.
The PDE5 class on this site
Here is the class you keep meeting:
| Ingredient | Common brand | Chapter on this site |
|---|---|---|
| Sildenafil | Viagra | viagra.html |
| Tadalafil | Cialis | cialis.html |
| Vardenafil | Levitra (Staxyn ODT) | levitra.html |
| Avanafil | Stendra | (not a dedicated GPXL chapter—mentioned for class completeness) |
WebMD’s Cialis/Levitra/Staxyn/Viagra page and SingleCare’s “best ED pills” section use that same core set. Duration is the big split: tadalafil’s long window (often discussed around ~36 h) vs shorter clocks on sildenafil and vardenafil. Map yourself to a chapter with the table, then open generics.html when you need the head-to-head duration and food rules.
How erectile dysfunction pills work
Oral PDE5 inhibitors do not invent arousal for you. They slow cGMP breakdown in penile tissue after sexual stimulation has already started nitric oxide signaling. More cGMP → smoother muscle relax → more blood flow.
Labels keep saying sexual stimulation is required for a reason. A quiet tablet on a quiet night is not a guaranteed erection machine. Mechanism is shared across the class. Timing, food, and half-life are where you pick a molecule—compare page again.
Prescription access (not OTC)
In the US you need a prescription for the labeled PDE5 ED pills above.
You talk with a clinician (clinic or telehealth). Then a pharmacy fills an identified product. That is the SingleCare/Healthline frame. A cart that ships “ED pills” and never asks for a prescription is not that path. Run the pharmacy online checklist before you trust it.
OTC and supplement claims
OTC “ED pills” and male-enhancement supplements are not labeled sildenafil, tadalafil, or vardenafil.
SingleCare’s nonprescription notes and Healthline’s OTC pages warn about weak evidence and adulteration. WebMD’s online ED-drug risk theme matches: the photo on the ad is not a lab assay. You want a labeled PDE5 tablet? You want the prescription path—not a vitamin bottle that borrowed the brand name.
Shared safety stops
Never stack oral PDE5 ED pills with nitrates or nitric oxide donors. Absolute stop. Class-wide.
Blood pressure can fall hard when those pathways stack. Alpha-blockers and strong CYP3A4 inhibitors are separate label caution. Skip any “most effective ED pill” list that never mentions nitrates.
Suspected overdose or urgent poisoning in the US? Poison Help: 1-800-222-1222.
FAQ
What are ED pills?
Usually prescription PDE5 inhibitors for erectile dysfunction—sildenafil, tadalafil, vardenafil, and sometimes avanafil.
What are erectile dysfunction pills if not Viagra?
Viagra is one brand of sildenafil. Cialis (tadalafil) and Levitra (vardenafil) are other labeled options in the same class.
Which ED pill is most effective?
There is no single winner for everyone. Duration, food rules, and daily vs as-needed needs differ. See generics.html.
Can I buy ED pills over the counter?
Labeled PDE5 tablets for ED are not OTC in the US. Supplement aisle products are a different category.
Do ED pills work without sexual stimulation?
No. PDE5 inhibitors need upstream arousal signaling to matter.
Are nitrates safe with ED pills?
No. Never combine oral PDE5 inhibitors with nitrates.
Does GenPharm XL sell ED pills?
No. These chapters are educational.
How do I choose a path among ED pills?
If you already know the ingredient, open that molecule chapter. If you are still comparing duration and food, open generics.html. If you need seller legitimacy first, open index.html.
Where should I go next?
Molecule chapters for buy and dose detail, the compare page for timing, or the pharmacy online checklist for fill literacy.
Next step
Choose your path: Viagra, Cialis, or Levitra for a single tablet, generics.html if you are still choosing among them, or pharmacy online if the seller is the open question.