01 Section
Twenty milligrams is the ceiling people review as if it were the start
Twenty milligrams is the ceiling people review as if it were the start. Forum threads treat 'Levitra' as one feeling. The film-coated ladder is four tablets: 2.5 mg, 5 mg, 10 mg and 20 mg. For most men the labelled start is 10 mg about 60 minutes before sex, then a step to 20 mg or down to 5 mg. Twenty milligrams is a real, studied strength. It is also the dose that sits on this domain's title line. It is not a casual first swallow in a man of 70, on ritonavir, or on an antiarrhythmic the QT section already named.
What makes vardenafil different from the other two PDE5 tablets on this shelf is not a secret extra hour of magic. The half-life is short, in the same 4-to-5-hour neighbourhood as sildenafil, not the 17.5-hour tail of tadalafil. The extra lines are a QT caution the other two labels do not write the same way, a melt-in-mouth product that is not interchangeable with the 10 mg swallow, and a food effect that can cut Cmax by 18% to 50% after a high-fat meal even though the tablet 'may be taken with or without food'.
I write this as a daylight note, not a shop review. Dr. Ingrid Sørensen checks the ladder against the film-coated and Staxyn labels. The PDE5 comparison is the wide row if you still have not picked a molecule. The mailbox [email protected] takes corrections. It does not take orders.
02 Section
Food, onset, and why this is still a short-acting tablet
Fasted 20 mg tablets reach a peak between 30 minutes and 2 hours, median 60 minutes. Absolute bioavailability is only about 15%, which is leaner than sildenafil's roughly 41%. Two food-effect studies on the film-coated tablet found a high-fat meal cut Cmax by 18% to 50%. The label still allows the tablet with or without food. 'Allowed' and 'same peak' are different claims. If a first 20 mg night follows a heavy plate, I treat a soft result as a possible late or lower peak before I call the strength wrong.
The duration is hours, not a weekend. Terminal half-life is about 4 to 5 hours in ordinary use. That is why vardenafil never grew a daily ED regimen the way tadalafil did, and why a Friday tablet does not cover Sunday. Men who want a long window are on the wrong molecule, even if they love a 20 mg review. The tadalafil note is the 36-hour conversation; this page is not going to borrow it.
Alcohol at 0.5 g/kg with vardenafil 20 mg did not add a further hypotensive effect over four hours in healthy volunteers, and neither drug's level changed. I still do not use a first 20 mg night to test a bottle of wine. Headache, flushing, dyspepsia and rhinitis were the common trial complaints, with a dose trend across 5, 10 and 20 mg. Back pain was close to placebo. Visual colour change is less often the story than with sildenafil, which fits a tighter PDE5-over-PDE6 profile, but 'less often' is not 'never'.
03 Section
The labelled ladder under 20 mg
The film-coated ladder under 20 mg is not a suggestion from a forum. 2.5 mg exists because some pairings make ordinary doses unsafe. With ritonavir the cap is a single 2.5 mg tablet in a 72-hour period; that pairing raised vardenafil AUC about 49-fold and stretched the half-life to 26 hours. With indinavir, saquinavir, atazanavir, ketoconazole 400 mg daily, itraconazole 400 mg daily or clarithromycin the cap is 2.5 mg in 24 hours. Ketoconazole 200 mg daily, itraconazole 200 mg daily and erythromycin: no more than 5 mg in 24 hours.
Five milligrams is the start I want in a man 65 or older - mean Cmax about 34% higher and AUC about 52% higher than in younger men - and in a man already stable on an alpha-blocker. Moderate hepatic impairment (Child-Pugh B) starts at 5 mg and must not go above 10 mg. Those are labelled limits, not timid habits. Jumping them because a review praised 20 mg is how a first night becomes a fainting story.
Ten milligrams is still the recommended start for most patients without those flags. Sexual stimulation is required. One tablet a day is the frequency cap. If 10 mg is not enough and the side effects are tolerable, 20 mg is the labelled ceiling, not a second 10 mg stacked the same evening. If 10 mg is too much flush or headache, 5 mg is the labelled step down. Reviews that skip this ladder and only shout '20 mg worked for me' are reviewing a different patient.
04 Section
The QT line the other two tablets do not write the same way
QT prolongation is the one cardiac sentence that belongs on a vardenafil note before the food paragraph. In 59 healthy men, vardenafil 10 mg and a supratherapeutic 80 mg dose produced QTc increases in the same range as moxifloxacin 400 mg, the active control. A later study that paired vardenafil with another drug of comparable QT effect showed an additive change. The label's instruction is blunt: men with congenital long QT, and men on Class IA antiarrhythmics (quinidine, procainamide) or Class III (amiodarone, sotalol), should avoid vardenafil.
That is not a polite hedge. It is a reason I will pick sildenafil or tadalafil - or no PDE5 tablet at all - when the medication list already has a rhythm drug. Most men on this shelf do not carry that list. For them the QT line is a screen, not a daily worry. Skipping the screen because a generic 20 mg review was cheerful is the mistake.
The shared class walls still apply. Nitrates and nitric oxide donors are contraindicated. A suitable gap after vardenafil before a nitrate can be given has not been defined; the contraindication is the rule. Riociguat sits with the same ban. Alpha-blockers need a stable baseline and a 5 mg vardenafil start. Sudden vision loss in one or both eyes, or sudden hearing change, means stop the tablet and get urgent care - the NAION and hearing warnings are class language, not vardenafil folklore.
05 Section
Who a 20 mg start actually fits
Men who already tried 10 mg, had a partial result and a quiet side-effect list, and have no QT drug, no nitrate, no strong CYP3A4 inhibitor and no unstable alpha-blocker: those are the men I will take to 20 mg. It is a step on a labelled ladder, not a personality. A first prescription of 20 mg in a man over 65, or in a man whose list I have not seen, is the review culture talking, not the film-coated label.
I also want a reason vardenafil is the molecule at all. If the draw is 'I heard it is stronger than Viagra', that is not a reason. If the draw is a prior sildenafil flush or a blue tinge that got in the way, vardenafil is a fair second try. If the draw is a long weekend, it is the wrong class member. If the draw is a melt-in-mouth tablet because swallowing is hard, you are talking about the ODT, not about 20 mg film-coated, and you still need the exposure warning.
This shelf does not invent a cash price for generic 20 mg. Fills move. Reviews that rank a tablet by a dollar figure from last year are already stale. Read the strength on the bottle, then read the vardenafil note for the full interaction list. The comparison page stays one click away when the molecule itself is still in doubt.
06 Section
Staxyn is not a 10 mg swap
Five products people flatten into one review
- 2.5 mg film-coated: ritonavir (72 h cap) and several other strong CYP3A4 caps
- 5 mg film-coated: age 65 and over, alpha-blocker start, some moderate CYP3A4 pairings
- 10 mg film-coated: usual start for most men; not the same exposure as Staxyn 10 mg
- 20 mg film-coated: labelled ceiling on this shelf's lock; not a first tablet for the flagged groups
- Staxyn 10 mg ODT: higher exposure than swallowed 10 mg; place on the tongue; no liquid
Staxyn dissolves on the tongue and was never a milligram-for-milligram twin of swallowed Levitra 10 mg. It is a 10 mg orally disintegrating tablet, placed on the tongue, taken without liquid. The Staxyn label states it is not interchangeable with vardenafil 10 mg film-coated tablets because it provides higher systemic exposure. In healthy volunteers the mean Cmax and AUC from Staxyn were about 15% and 44% higher than from 10 mg film-coated tablets. Median Tmax on an empty stomach sat around 1.5 hours.
That is why a man who 'took 10 mg' in a review might have taken a different product from the 10 mg swallow in your bottle. Brand-name Levitra and Staxyn have been discontinued in the United States. Generic film-coated tablets and generic ODT still appear. The name on the box matters. If the tablet is meant to melt, do not wash it down. If the tablet is film-coated, do not assume it matches an old Staxyn memory.
Staxyn has its own limits. It is not for moderate or severe hepatic impairment. It is not for men on dialysis. A high-fat meal did not change Staxyn AUC or Tmax in healthy volunteers and cut Cmax by 35%. Clinical trials ran without regard to meals. None of that turns the ODT into a 20 mg film-coated tablet, and none of it lets you treat 20 mg swallowed as 'just two Staxyn'.
07 Section
Reading generic reviews without mixing the strengths
Reviews that mix 2.5 mg, 10 mg, 20 mg and an old Staxyn memory are reviewing four exposures. Before you trust a paragraph that says 'Levitra was great', ask which tablet, which milligram, whether it melted, and whether a nitrate or an amiodarone sat in the same cabinet. This note holds 20 mg as the lock and keeps the smaller starts and the ODT in view so that lock is honest.
Take the bottle list to a prescriber who will look at the QT line. I sign the consults below. If a sentence here drifted from the film-coated or Staxyn label, write [email protected]. The three-tablet comparison is the last page I want open if 20 mg was never the right molecule, only the loudest review.