01Three prescriptions, three clocks
A man who types Cialis vs Viagra vs Levitra prescription into a bar is usually trying to pick one visit. He should leave with one INN. Stacking two PDE5 fills in the same week is how the class gets doubled.
Tadalafil is the only one of the three with a labeled once-daily ED board (2.5 mg starting, 5 mg if stepped up) plus an as-needed board that can sit at 20 mg. Sildenafil and vardenafil are as-needed clocks with roughly 4-hour stories.
This sheet will not tell you which tablet 'works best.' Head-to-head marketing pages do that without a chart. The dockets file the stops. Read tadalafil, sildenafil, and vardenafil before you treat a color as a decision.
Uxora does not prescribe. [email protected] is for sourcing. A licensed clinician where you live still has to write the script.

02Which intake form belongs on which molecule
If the visit is really 'I want a calendar, not a timer,' the tadalafil daily 5 mg board is the labeled tool among these three. If the visit is 'one evening, lowest first tablet,' sildenafil 25 mg is this site's first-rung lock. If the visit names amiodarone, the Levitra form may need to close before milligrams are discussed.
Walgreens-style sildenafil pages and Ro-style Cialis pages both still require a clinician. The pair sheet does not create a third shop that sells all three in one carton.
Brand names help patients recognize a box. Generic INNs are what the e-script should carry unless brand is medically required. Cheap, when it happens, is a generic window print after that script, not a reason to pick the loudest ad.
Staxyn (vardenafil ODT) and Revatio (sildenafil for PAH) are other product lines. They do not belong on a Cialis-vs-Viagra-vs-Levitra evening chart.
| INN (brand) | Uxora first talk | Usual labeled start | Clock that matters |
|---|---|---|---|
| Tadalafil (Cialis) | Daily 5 mg and/or PRN 20 mg | Daily 2.5 mg; PRN 10 mg | PRN effect vs placebo to 36 h |
| Sildenafil (Viagra) | 25 mg first tablet | 50 mg for most adults | Effect shown to 4 h |
| Vardenafil (Levitra) | 2.5-10 mg after QT | 10 mg ~60 min before sex | t½ 4-5 h; food cuts Cmax |
03How a pair sheet helps a prescriber pick one INN
Use the sheet to name the schedule in one sentence: calendar (tadalafil daily 5), first low as-needed (sildenafil 25), or short as-needed after a clean QT list (vardenafil 2.5-10). Then open that docket, not all three carts.
AUA and clinic pages often say the oral PDE5 class is similar in efficacy when doses are comparable, and that duration and food are the practical splits. This sheet agrees with that boring conclusion. It will not invent a winner percentage.
Sildalist and other export combos are not a fourth column. Two INNs in one blister still carry two nitrate bans. They are not a pair-sheet shortcut.
Portugal readers still need a prescriber licensed in their country. A US telehealth title does not become a Cedofeita fill because this pair page used the word online.
Write the schedule in one sentence on the intake: calendar, first 25 mg tablet, or short as-needed after QT. Then stop ticking boxes.
04Food and alcohol do not treat the class the same
Tadalafil may be taken without regard to food. That is the practical reason couples pick it when dinner is the event. It is not a reason to drink five units on top of a 20 mg tablet.
Sildenafil with a high-fat meal delays Tmax by about 60 minutes and drops Cmax 29%. The 25 mg first tablet is the setting where that delay ends the night. The meal memo stays on that molecule.
Vardenafil high-fat studies cut Cmax 18% to 50%. The 'fast Levitra' headline dies on a heavy plate. The onset file keeps that number next to the 2.5-10 mg range.
Alcohol is a class vasodilator add-on. Only Cialis's leaflet bothers to name 5 units as the orthostatic example. The other two still drop blood pressure with drink. Do not use a glass as a timer for any of them.
06Brand Levitra left some shelves; the INN did not
Hims-style drug pages already say brand Levitra is gone in some markets and generic vardenafil is the usual fill. That does not delete the QT paragraph. A generic 10 mg tablet still avoids Class IA and III drugs.
Brand Cialis and brand Viagra still exist as higher cash rows. The cheap search under this pair title is almost always generic tadalafil, sildenafil, or vardenafil after a real script. This sheet will not invent a brand-versus-generic dollar.
Export combos that print both sildenafil and tadalafil in one blister are not a fourth column and not a bargain version of this pair. Two INNs still carry two nitrate bans and two CYP stories.
If a portal offers 'the doctor's choice pack' with rotating INNs, treat that as a stacking risk until a clinician names one molecule for a defined period. Rotation is not a labeled schedule.
Stendra (avanafil) is a fourth oral PDE5 some comparison pages add. It is not on this site's pair lock. Do not borrow its 15-minute marketing line to justify a 20 mg Levitra first fill.
07What a first prescribed-online visit should collect for all three
Chest-pain sprays, poppers, riociguat, alpha-blockers, protease inhibitors and other CYP3A4 drugs, recent infarct or stroke, and whether sex is medically reasonable. Vardenafil adds the QT list. Sildenafil adds the meal timing if 25 mg is the first tablet. Tadalafil adds which board, daily 5 or PRN 20.
Walgreens Virtual Healthcare and Ro still describe a clinician review before a pharmacy. That sequence is the only prescribed-online meaning this sheet will use. A no-history cart is not a third option.
A cheap prescription, when it prints, prints at a licensed window after that review. Sourced US cash bands live on the three dockets. This pair page will not invent a comparison price.
Portugal readers mail [email protected] only if a card and a leaflet disagree. They do not mail a shopping list. Emergencies: 112.
Sofia Mendes reviewed the locks on 2026-08-21. She will not pick a winner from Cedofeita 455 because a title said Cialis vs Viagra vs Levitra.
08Do not stack two PDE5 fills
If a first INN failed, the next visit should say how it was taken (food, alcohol, stimulation, dose, other drugs), not add a second molecule on top of a leftover blister.
Weekend tadalafil 20 mg plus a Sunday sildenafil 25 mg is two PDE5 exposures. The memos on each docket exist so that mix-up has a file. They are not permission slips.
Sofia Mendes reviewed this sheet on 2026-08-21. She does not rank the three for a stranger and does not ship from Rua de Cedofeita 455.
Read the docket disclaimer before you change a tablet. If the remaining question is one molecule, leave this sheet and open that docket.
Sources
- DailyMed Cialis label
- DailyMed Viagra label
- DailyMed Levitra label
- Ro class-comparison visit page (register)
Checked against the current label and reviewed by Dr. Sofia Mendes. See Intake, Markup, Peer-pass, File.