ED medications are best compared by active ingredient, labeled schedule, dosage form and safety profile, not advertising that promises instant erections. Sildenafil, tadalafil, vardenafil and avanafil are four oral phosphodiesterase type 5 (PDE5) inhibitors with U.S. approvals for erectile dysfunction. They share a broad mechanism, but each ingredient has its own directions, food considerations, interactions and product-specific FDA records. Injectable alprostadil is a different prescription treatment modality, not another PDE5 tablet.
This directory connects readers with FDA-approved oral drug categories, familiar brands, approved generics, scheduling options and meaningful care questions. It is not a storefront or a ranking of medicines by efficacy. Levitra and Staxyn are historical discontinued U.S. brands, while generic vardenafil product records require separate checks. The existence of an FDA approval or product listing is not real-time evidence of stock, and an advertised foreign brand is not automatically an approved U.S. generic.
Start with sildenafil, tadalafil, vardenafil, or the avanafil prescription-product guide. For non-pill options and when additional clinical evaluation is appropriate, see the treatment-options comparison. None of these pages substitutes for an individual clinician's assessment of ED and cardiovascular health.
Sildenafil, tadalafil, vardenafil and avanafil support the body's erectile response in the presence of sexual stimulation. They do not directly increase sexual desire or guarantee an erection. The most useful distinctions involve timing in the U.S. label, availability of a prescribed daily regimen, dosage form, brand lifecycle and patient-specific safety considerations; the FDA does not designate a universal best pill for everyone.
The comparison is a product directory, not advice to change medicines or strengths. Read the exact FDA-approved label for the product dispensed and discuss treatment suitability with a prescriber.
| Ingredient | Common U.S. brand context | Typical prescription schedule | Useful next page |
|---|---|---|---|
| Sildenafil | Viagra and approved generic sildenafil ED tablets | As needed; meal timing may matter | Sildenafil guide |
| Tadalafil | Cialis and approved generic tadalafil | As needed or once daily for eligible patients | Tadalafil guide |
| Vardenafil | Levitra is a discontinued U.S. brand; generic tablets have approved applications | As needed; check drug-specific precautions | Vardenafil guide |
| Avanafil | Stendra and FDA-approved generic avanafil tablets | As needed; timing directions depend on the prescribed strength | Avanafil product and Rx guide |
Sildenafil for ED is commonly associated with the Viagra brand and approved generic tablets. Its U.S. ED labeling describes as-needed use in relation to sexual activity, while food—particularly a high-fat meal—can affect how quickly the response begins. The sildenafil hub explains the ingredient; Viagra and generic sildenafil address brand and generic identity.
A crucial product distinction is sildenafil used for pulmonary arterial hypertension (PAH). The same ingredient can appear under different labeled indications, formulations, strengths, and regimens. A PAH product listing should not be treated as interchangeable with an ED prescription just because the ingredient name matches.
Tadalafil is notable because U.S. labeling supports both as-needed and once-daily ED treatment frameworks. Its longer studied response window with as-needed treatment is not a promise of a continuous erection or identical results for all patients. The tadalafil hub and daily versus as-needed tadalafil comparison explain why these are distinct prescribing decisions.
Tadalafil also has approved clinical use in certain circumstances involving benign prostatic hyperplasia, adding a prescribing consideration not shared by the other two main ED products in this directory. A pharmacist must verify the actual prescription rather than infer intent from a brand name or tablet strength.
Vardenafil is another oral as-needed PDE5 inhibitor. The historic Levitra and Staxyn names still appear in searches, but discontinued U.S. brand marketing should not be interpreted as a current purchase option. Product status for generic vardenafil and different dosage forms must be checked individually; an FDA approval record does not assure stock.
Use the vardenafil product hub for the medicine and the Levitra brand overview for its marketing history. Orally disintegrating tablets have formulation-specific considerations, covered separately in the vardenafil ODT guide.
Avanafil is a fourth U.S.-approved oral PDE5 inhibitor for ED, commonly recognized through the Stendra brand. FDA approved the first generic avanafil tablets in 2024. Its as-needed administration language varies by labeled tablet strength, and those label intervals do not guarantee a response at a fixed minute. The sildenafil versus avanafil comparison provides a more focused timing discussion.
Unlike tadalafil, avanafil does not have the same labeled lower-strength continuous once-daily ED regimen. Brand or generic availability must be verified for the prescribed strength with a licensed pharmacy. The avanafil access guide describes FDA product identification, prescribing and pharmacy checks without pretending to confirm real-time stock or individual suitability.
The dosing schedule is one of the most practical distinctions among ED medications. Sildenafil and conventional vardenafil ED tablets are typically prescribed as-needed. Tadalafil has labeled as-needed and once-daily approaches. Neither schedule is universally more suitable, and daily use of a drug should never be improvised from an as-needed prescription.
For the full framework, compare daily vs as-needed ED medications and then review the specific tadalafil pages. Timing values in product labeling indicate tested or recommended administration windows, not a guaranteed onset of action for a particular person.
FDA-approved generics are evaluated through a regulatory framework covering relevant quality and bioequivalence or therapeutic-equivalence requirements. A pharmacy substitutes products under applicable law and the prescription’s instructions. Generic does not mean that every product with the same ingredient found online is FDA-approved. Likewise, a recognizable foreign brand name does not establish authorization for U.S. sale.
The brand-versus-generic comparison explains how to read these claims. Specific approved products can be identified by the ingredient, labeled dosage form and strength, applicant, and relevant approval details; those identifiers are more useful than a marketing photo.
People often compare ED drugs by how quickly they may work or how long a response window may last. These are different dimensions. An onset estimate is not a guarantee, and elimination half-life is not equivalent to the duration of an erection. Frequency of sexual activity, meals, and personal tolerability may affect the discussion with a prescriber.
Use the dedicated onset comparison, duration comparison, and side-effects comparison rather than assuming any single medicine is best for everyone.
Tablet strength listings are product facts, not guidance for selecting the strongest tablet. The correct prescription considers potential adverse effects, interacting drugs, age-related considerations, liver or kidney function, and prior response. More milligrams do not provide a valid cross-drug comparison, because sildenafil, tadalafil, and vardenafil are different active ingredients.
For ingredient-specific label and dosing context, see sildenafil dosage, tadalafil dosage, and vardenafil dosage. The pages explain regulatory and clinical frameworks without supplying personalized dosing instructions.
All three main PDE5 inhibitors have important interaction warnings. Use with nitrates or nitric-oxide donors can cause a dangerous drop in blood pressure; concomitant use with riociguat is also contraindicated. Patients taking cardiovascular drugs, alpha-blockers, and interacting medicines require a clinician’s assessment. Vardenafil has additional warnings relevant to QT prolongation and particular antiarrhythmic medicines.
An erection lasting longer than four hours requires emergency care. Sudden vision or hearing loss warrants stopping the medicine and seeking prompt medical attention. These warnings are part of choosing a prescription, not optional details to consider after ordering.
A prescription requires a genuine medical evaluation; a shopping cart or paid questionnaire alone does not guarantee that a particular medicine will be prescribed. Telehealth may be a lawful option when an appropriately licensed clinician determines it is suitable. The pharmacist then verifies the prescription and dispenses the exact product or a permitted equivalent.
To understand the distinction between evaluation and fulfillment, see online ED prescriptions and ED telehealth. Ingredient-specific pharmacy routes are available in buy sildenafil, buy tadalafil, and buy vardenafil.
The amount charged may depend on the ingredient, brand or approved generic, dosage form, quantity, pharmacy, insurance terms, and other services. Because these variables change, a universal price table can mislead rather than help. The ED medication cost comparison focuses on durable factors rather than numerical prices or promises about savings.
For a useful pharmacy comparison, request a quote for the exact prescribed strength, dosage form, quantity, and payment method. Ask what the all-in amount includes, whether other fees may apply, and how the pharmacy handles substitutions or stock changes. Obtain a fresh quote rather than assuming an old offer remains valid.
Oral prescriptions may be inappropriate or insufficient for some patients. Clinical evaluation can lead instead to risk-factor treatment, counseling, devices, or therapies such as alprostadil under specialist direction. Comparing treatment categories is a medical decision and should not be reduced to a medication price contest.
See ED treatment options for a broad discussion, then visit the relevant ingredient hub for its exact formulation and safety profile. This directory is designed to help organize decisions, not to provide independent medical clearance or recommend combining different PDE5 inhibitors.
Four FDA-approved oral PDE5 ingredients are sildenafil, tadalafil, vardenafil and avanafil. They differ in labeled schedules, product forms and safety precautions, so a clinician determines which, if any, is appropriate.
No. Medical history, other medicines, preferred schedule, side effects, and treatment goals affect the choice.
Tadalafil has an approved once-daily ED regimen as well as an as-needed regimen. A clinician determines which approach, if any, is appropriate.
FDA-approved generics meet applicable quality and bioequivalence requirements. A pharmacist can explain substitution rules for the specific product.
No. These ED medicines require valid prescriptions in the United States.
No. Duration, onset, efficacy, and tolerability describe different aspects of treatment; longer is not necessarily better for every patient.
No. Historic brand marketing status and actual generic availability are separate questions that need product-specific verification.
Yes. Avanafil is a prescription PDE5 inhibitor available as Stendra and through specific approved generic applications. Labeled ED use is as needed, and FDA approval does not guarantee current pharmacy stock.