01Why Halo locks Cialis 2.5 daily vs Viagra 100 vs Levitra 2.5
Six lines before a brand argument
Halo locks this contrast on Cialis 2.5 daily vs Viagra 100 vs Levitra 2.5 so the card names three real labeled rungs, not a fantasy milligram swap. Forums treat 2.5, 100, and 2.5 as if they sit on one ladder. They do not. Tadalafil, sildenafil, and vardenafil share one enzyme and one nitrate ban. The locked strengths do not share a job.
US Cialis once-daily use for ED starts at 2.5 mg, taken about the same time each day, without tying the swallow to sex. The label may raise that strip to 5 mg. Viagra for most adults starts at 50 mg as needed; 100 mg is the labeled ceiling after effect and side effects are known. Levitra for most adults starts at 10 mg about 60 minutes before sex. The 2.5 mg tablet is the lowest film-coated strength, and the label uses it as a hard cap with several strong CYP3A4 inhibitors.
Capture those three jobs first. Then open the matching brief. Cheap generic reviews and online order pages will still try to rank the class by color. This sheet ranks them by clock, food, and the list in the drawer.
02What a contrast cost review can say without a made-up price
| Locked rung | What you are paying for | What a coupon cannot change |
|---|---|---|
| Cialis 2.5 daily | A once-daily strip, same clock each day | Nitrate hold; 17.5 h half-life; one tablet per day |
| Viagra 100 | One ceiling as-needed swallow | Food delay; 4 h half-life; once per 24 h |
| Levitra 2.5 | Lowest labeled film-coated tablet | QT footnote; CYP caps; once per 24 h unless the label says 72 h |
A coupon page will invent a number by Tuesday. Halo will not. This contrast has no fill table and no guessed dollar. Cialis 2.5 daily vs Viagra 100 vs Levitra 2.5 is a cost conversation about how you pay for time, not about a screenshot from a cash-pay board.
A daily 2.5 mg tadalafil strip is a month of swallows. One Viagra 100 is a single ceiling night after a clinician already walked the 50 mg step. A Levitra 2.5 is often a safety rung on a crowded CYP list, not a bargain starter you order because the milligram looks small. Price per tablet and price per ready week are different math. Generic boards move. Prescription coverage moves. Inventing either figure here would be a lie.
If you came for a cheap online quote, stop on this sentence. Ask your pharmacy what that specific strength costs this month. Then come back and read which rung you are actually buying. Reviews that skip the job and print a coupon are advertising, not a contrast.
03Can one household order all three rungs at once?
Order rules the lens will not soften
- Do not run two oral PDE5 inhibitors on the same day
- Do not add a Viagra 100 on top of a Cialis 2.5 daily strip
- Do not treat Levitra 2.5 as a harmless extra because the milligram looks small
- Tell emergency teams the molecule name and the last dose time
One household drawer with three PDE5 bottles is how people invent a cocktail. Daily tadalafil plus a borrowed Viagra 100 on a Saturday is two pathways, not a boost. The labels do not green-light that stack. Hypotension, headache, and flush rise. Benefit does not get a second labeled trial.
Order a switch only after the list is clean: nitrates, poppers, riociguat, alpha-blockers, strong CYP3A4 inhibitors, QT drugs if vardenafil is in play. Bring the last swallow time. A Friday Cialis 2.5 daily strip is still on board Saturday. A Viagra 100 from last night is a shorter tail, not permission to add Levitra in the morning.
Online packs that ship mixed brands in one envelope skip that audit. Halo will not pretend that is a prescription path. Pick one brief, one rung, one clinician who has the rest of the chart.
04What each locked tablet is actually for
| Locked tablet | Usual labeled job | Common misread |
|---|---|---|
| Cialis 2.5 daily | Once-daily ED start; same time each day | Treated as a weak weekend 20 |
| Viagra 100 | Ceiling after 50 mg is known | Treated as the default first pill |
| Levitra 2.5 | Lowest tablet; CYP3A4 dose cap | Treated as a cheap starter because 2.5 looks small |
Milligram numbers do not convert across molecules. Twenty milligrams of tadalafil is not one hundred milligrams of sildenafil. Two-and-a-half milligrams of vardenafil is not two-and-a-half milligrams of tadalafil. If a review site prints a conversion chart, close it.
Cialis 2.5 daily is the US once-daily ED start. Swallow it at about the same hour. Food does not rebuild the plan. Sex does not have to sit on the clock. Steady-state plasma levels land by about day 5, with roughly 1.6-fold accumulation versus a single dose. That is continuous exposure. BPH once-daily use on the US label is 5 mg, not this 2.5 start. Severe renal impairment: once-daily Cialis is not recommended. With ritonavir or ketoconazole, the daily tadalafil ceiling is 2.5 mg.
Viagra 100 is the top of the 25 / 50 / 100 ladder. Most adults start at 50 mg about an hour before sex, anywhere from 30 minutes to 4 hours. Age over 65, cirrhosis, creatinine clearance under 30 mL/min, or a strong CYP3A4 inhibitor: the usual conversation starts at 25 mg. Jumping to 100 because an online pack only stocked the ceiling is not titration.
Levitra 2.5 exists on the bottle as 2.5 / 5 / 10 / 20. Most adults start at 10 mg. Age 65 and over: consider 5 mg. Moderate hepatic impairment: start 5 mg, do not pass 10 mg. The 2.5 mg tablet is the labeled cap with ritonavir (no more than 2.5 mg in 72 hours), and with several other strong CYP3A4 inhibitors (no more than 2.5 mg in 24 hours). It is a safety rung. It is not Halo's idea of a first date tablet.
05Why Levitra 2.5 sits on this card next to a 100
| List finding | Levitra 2.5 implication |
|---|---|
| Ritonavir or cobicistat | No more than 2.5 mg in 72 hours |
| Ketoconazole 400 mg, itraconazole 400 mg, clarithromycin, several PIs | No more than 2.5 mg in 24 hours |
| Ketoconazole 200 mg, erythromycin | 5 mg cap in 24 hours - 2.5 is not the automatic pick |
| Congenital long QT or IA/III antiarrhythmic | Avoid vardenafil; pick another PDE5 after the list review |
| Clean list, prior sildenafil visual bother | Usual start is still 10 mg, not 2.5, unless the clinician aims lower |
Ritonavir turns the 2.5 milligram tablet into the whole vardenafil story. In the labeled interaction, ritonavir 600 mg twice daily with Levitra 5 mg raised vardenafil AUC 49-fold and Cmax 13-fold, and stretched half-life to about 26 hours. The cap is a single 2.5 mg in 72 hours. That is why Halo locked Levitra 2.5 on a card that also names Viagra 100. One number is a ceiling. The other is a brake.
QT language is the other reason this rung is here. Therapeutic 10 mg and supratherapeutic 80 mg vardenafil both moved QTc in a thorough QT study in healthy men. A later pairing with gatifloxacin showed an additive shift. The insert tells clinicians to avoid congenital long QT and Class IA or III antiarrhythmics such as quinidine, procainamide, amiodarone, or sotalol. Walk vardenafil QT screen before you treat a 2.5 mg tablet as the polite small start for a rhythm chart.
Brand Levitra left many US shelves. Generic vardenafil film-coated tablets still carry the same 2.5 mg strength and the same footnotes. Onset notes for a clean list live in vardenafil onset notes. If the list is not clean, open sildenafil or tadalafil instead of forcing this rung.
06How the Montreal lens picks a first brief
| Week you actually live | First brief to open |
|---|---|
| Wants readiness without a timer | Tadalafil brief - 2.5 daily conversation |
| Dinner-centered nights, rare intimacy | Sildenafil brief - meal rules before a 100 |
| QT drugs or congenital long QT | Skip vardenafil; sildenafil or tadalafil after the list |
| Strong CYP3A4 inhibitor already on board | Read the cap row before any Levitra 2.5 order |
| ED plus labeled BPH overlap | Tadalafil brief - US BPH daily is 5 mg, not 2.5 |
| Blue-tinge distress on sildenafil | Tadalafil or vardenafil trial after QT screen |
Ask two calendar questions before brand memory. How often does intimacy actually happen. How much does a meal or a clock wreck the evening. Occasional planned sex on a lighter stomach still points many charts at sildenafil, with 100 mg only after the 50 mg step is honest. Weeks that want a background floor point at tadalafil 2.5 mg daily. A clinician who wants vardenafil selectivity after a clean QT pass opens vardenafil at a labeled start, not at 2.5 by default.
Failure on one rung is not failure of the enzyme until stimulation, alcohol, the plate, the dose, sleep, hormones, and vessels get a real look. Switching brands after one steak-night flop just burns a blister. Weekend planning for the long molecule sits in tadalafil weekend planning. Daily versus as-needed psychology sits in daily versus on-demand. Sildenafil steps sit in sildenafil dose steps.
07Dinner, the 29 percent peak cut, and who can ignore the plate
| Rung | Lead time people actually use | Plate rule | False failure |
|---|---|---|---|
| Viagra 100 | ~60 min (label: 30 min to 4 h) | High fat delays and blunts peak | Steak, then a second tablet |
| Levitra 2.5 or usual 10 | ~60 min | High fat can cut Cmax sharply | Calling 2.5 'too weak' after a heavy meal |
| Cialis 2.5 daily | Same hour each day; not tied to sex | Food usually not the story | Adding a sildenafil guest tablet |
A high-fat plate cuts sildenafil peak by a mean 29 percent and pushes Tmax about 60 minutes later. That is the Viagra 100 trap after a steak. Couples call the tablet weak. The insert called the meal. Retry on a lighter stomach before you abandon the molecule. Details live in sildenafil meal timing.
Vardenafil film-coated tablets also lose peak with high fat: labeled food studies cut Cmax by 18 to 50 percent. The Levitra insert still says the tablet may be taken with or without food. That is not the same as 'fat never matters.' If onset is the complaint, ask what was on the plate. Staxyn-type ODT products are a different set of handling rules. Do not borrow milligrams from the film-coated 2.5.
Tadalafil is the food-forgiving row. Cialis may be taken without regard to food. That is a real lifestyle split for dinner-centered weeks, and it is one reason a daily 2.5 mg strip is easier to live with than a Viagra 100 that has to beat the roast. It is not a reason to stack both.
08The hold that outlasts any generic review
| Exposure | Nitrate teaching on the labels we read |
|---|---|
| Any Cialis dose, including 2.5 daily | Contraindicated; emergency nitrate wait at least 48 h if later judged necessary |
| Viagra 100 | Contraindicated; 24 h plasma is low in healthy adults, safety of nitrates then still unknown on the insert |
| Levitra / vardenafil, including 2.5 | Contraindicated; do not invent a shorter home gap |
| Riociguat | Contraindicated across the class |
| Stable alpha-blocker | Hypotension caution - staged start, not a nitrate substitute |
Organic nitrates stay forbidden on every rung. Nitroglycerin, isosorbide mononitrate, isosorbide dinitrate, and recreational nitrites sold as poppers dump nitric oxide into the same pathway these drugs slow. Riociguat shares the mechanistic ban. Hours on a kitchen timer are not a home workaround.
Cialis 2.5 daily vs Viagra 100 vs Levitra 2.5 still share that wall. The clocks differ if emergency nitrate is later judged medically necessary. After tadalafil, the Cialis label wants at least 48 hours from the last dose, then close hemodynamic monitoring. After sildenafil 100 mg, plasma at 24 hours is far below peak in healthy adults, and the Viagra label still says it is unknown whether nitrates can be given safely at that hour. Vardenafil keeps the same class contraindication; do not invent a shorter DIY gap because the tablet was 2.5 mg.
Alpha-blockers are a softer hypotension line, not a nitrate loophole. Start one class, stabilize, then add the other under a prescriber plan. Daily tadalafil plus tamsulosin is a common real pair. It is still not permission to host a Viagra 100 the same night.
09Half-life, peak, and the weekend that is not a weekend
| Parameter | Cialis 2.5 daily (tadalafil) | Viagra 100 (sildenafil) | Levitra 2.5 (vardenafil) |
|---|---|---|---|
| Approx. terminal t½ | ~17.5 h | ~4 h | ~4-5 h (longer with ritonavir) |
| Typical Tmax | ~2 h (0.5-6 h) | 30-120 min, median 60 fasted | 30-120 min, median ~60 fasted |
| Teaching window | Daily floor; PRN teaching up to ~36 h | Up to ~4 h, weaker late | ~4-5 h as-needed |
| Food on the label | Without regard to food | High fat: Tmax +60 min, Cmax -29% | High fat: Cmax -18% to -50% |
| Once-daily ED path | Yes - 2.5 mg start, may go to 5 mg | No labeled daily ED path | No labeled daily ED path |
| Max frequency (usual) | One daily tablet | Once per 24 h | Once per 24 h (72 h with ritonavir) |
| Main clearance | CYP3A4 | CYP3A4 (major), CYP2C9 (minor) | CYP3A4 (major) |
Seventeen and a half hours is why tadalafil owns the long row. Mean terminal half-life in healthy adults is 17.5 hours. Teaching language for an as-needed Cialis dose still talks about a window out to about 36 hours. Daily 2.5 mg is a different story: the tablet is meant to keep a floor under the week, not to be chased with a second brand on Saturday.
Sildenafil and its N-desmethyl metabolite sit near a 4-hour half-life. A RigiScan study on the Viagra label still saw an effect at 4 hours, weaker than at 2 hours. Plan the evening. Do not plan Sunday brunch on Friday's 100 mg.
Vardenafil and its primary metabolite sit near 4 to 5 hours. Fasted Tmax after a 20 mg dose is usually 30 minutes to 2 hours, median about 60 minutes. That is a short cousin of sildenafil, not a tadalafil. Ritonavir is the ugly exception: it has stretched vardenafil half-life to about 26 hours in a labeled interaction study, which is why the 2.5 mg / 72-hour cap exists.
10File the contrast, then take the list to a clinician
Pick the brief that matches the week you actually live, not the milligram that looked cheapest in a banner. Cialis 2.5 daily is a floor. Viagra 100 is a ceiling. Levitra 2.5 is a brake on a crowded CYP or QT list more often than it is a first start. Same enzyme. Three jobs.
Shared rules do not move: stimulation, one pathway at a time, nitrates off the table, lead time that matches the molecule. Talk with your own prescriber or pharmacist before you start, stop, or change a dose, especially with heart, blood-pressure, or rhythm medicines. Halo Medix is a Montreal reference card. It does not write the script or ship the blister.
How to cite this page - Vancouver style
Halo Medix Lens Desk. Three labeled rungs: daily Cialis 2.5, Viagra 100, Levitra 2.5 [Internet]. Montreal: Halo Medix; 21 August 2026 [cited 2026 Aug 21]. Available from: https://halomedix.com/contrast/pde5/
Sources and how we reviewed this card
- FDA / DailyMed prescribing information - Cialis (tadalafil) tablets, including once-daily 2.5 mg ED start
- FDA / DailyMed prescribing information - Viagra (sildenafil citrate) tablets, 25 / 50 / 100 mg
- FDA / DailyMed prescribing information - Levitra (vardenafil HCl) film-coated tablets, 2.5 / 5 / 10 / 20 mg
- Product labels - nitrate and riociguat contraindications; CYP3A4 dose caps; vardenafil QT language
Method in brief: clip from primary sources, cross against the current FDA label, lens read by Dr. Camille Rousseau, MD, then file with a dated review. Full walk-through on the method page and editorial standards.