Read the QT line before anyone prices 10 mg or 20 mg
Electrical timing is the ping. Milligrams are the trace. Cash is allowed only after the flag.
Do not price a 20 mg strip, I will say it again, until you have asked about the tracing and the rhythm list. Vardenafil lengthens the QT interval more than this desk accepts as background noise. In a normal heart that is a number. In congenital long QT, or next to quinidine, procainamide, amiodarone, or sotalol, it is a reason to walk past this molecule and write a cousin.
The labelled open for most men is 10 mg about 60 minutes before activity, once a day at most, with a climb to 20 mg or a drop to 5 mg on effect and hangover. Potency is high. Plenty of men never need the 20 mg ceiling. Treating 20 mg as the default 'real' dose is how you buy more headache and a larger QT nudge for no extra erection.
Sexual stimulation is still required. The tablet does not invent desire. If the first evenings fail, I look at fat on the plate, lead time, and whether a rhythm drug I was not told about is sitting in the blister box at home. Price is the last conversation, not the first.
Four counters for a 20 mg six-pack after the QT flag
| Counter | Strip we checked | Band we saw | Desk note |
|---|---|---|---|
| Walmart Pharmacy | Generic vardenafil 20 mg × 6 | Big-box companion often a step above club cash | Walk-in Rx; companion card can beat a weak copay |
| Publix Pharmacy | Generic vardenafil 20 mg × 6 | Grocery companion usually clusters with other grocers, above club | Southeast grocery Rx desk |
| Sam's Club Pharmacy | Generic vardenafil 20 mg × 6 | Club companion often the leanest of this quartet | Membership warehouse Rx |
| Safeway Pharmacy | Generic vardenafil 20 mg × 6 | Grocery companion typically close to Publix, above club | Grocery Rx; not a coupon-site link |
Generic vardenafil is cheaper than vanished brand Levitra, yet it is still not a sildenafil-cheap molecule at most US counters. This desk checked a short teaching strip - 20 mg times 6 - at four licensed pharmacies. Coupon cards move the number; they do not become the href. Each row opens that chain's own pharmacy page.
Club desks often undercut grocery companions on this strength. Sam's Club companion cash is usually the leanest of this quartet. Walmart sits a step above the club on many zip codes. Publix and Safeway grocery companions cluster together, typically above the club desk. Exact dollars jump by county, so treat the bands as a map, not a quote you can screenshot forever.
A six-count is a teaching quantity, not a month of weekends. If a plan covers the tablet, compare the copay to cash-plus-companion before you assume insurance wins. This Edinburgh desk still does not fill the bottle.
Staxyn 10 mg is a different exposure, not a convenience swap
Film-coated Levitra-type tablets come in 2.5, 5, 10, and 20 mg. The orally disintegrating Staxyn tablet is 10 mg on the tongue, no water, and it is not interchangeable milligram-for-milligram with the swallowed 10 mg coat. Systemic exposure differs. A man who 'just got the melt ones' may be taking a different dose than the one you wrote.
That trap shows up at the counter when a computer offers a substitution. Ask. If the melt form is the plan, write it as the melt form. If the swallow is the plan, do not let a 10 mg ODT stand in because the numbers match on the bottle.
Neither form forgives a nitrate, a GC stimulator, or a QT-prolonging antiarrhythmic. Formulation is a preference. The flags are not.
Wuppertal follow-on, 2003 post, a caution for a trademark
Sildenafil proves the enzyme; Bayer advances a close PDE5 analogue.
FDA approves vardenafil as Levitra, co-marketed with GSK, tablets including 10 and 20 mg.
Dedicated QT work shapes the congenital-long-QT and antiarrhythmic avoid list.
Staxyn 10 mg ODT approved; not interchangeable with the film-coated 10 mg tablet.
Brand Levitra exits US retail; generic vardenafil remains the fill.
Bayer did not invent PDE5 blockade. Sildenafil had already opened the market. The Wuppertal chemistry group built a close analogue, co-marketed in the US with GSK as Levitra in 2003, the same year tadalafil arrived. Fast-follower is not an insult. It is why so much of the clock looks familiar and why the distinguishing sentence on the label is a caution rather than a new indication.
Brand Levitra later left US shelves. Generic vardenafil stayed. Staxyn followed in 2010 as the melt tablet. Men still say 'Levitra' the way they say 'Viagra' - as a household word for a class. This desk still writes the generic name on the script and the QT question in the note.
Cardiac-safety testing, not a marketing slogan, is what isolated this molecule. The path from laboratory to that footnote is in the journal note on Bayer's third PDE5 path to a 10 or 20 mg tablet.
Same enzyme, a louder electrical footnote
Arousal releases nitric oxide, cyclic GMP relaxes penile muscle, blood stays. PDE5 shortens that messenger. Vardenafil holds PDE5 with high potency, which is why 10 mg often does the job. No arousal, no messenger, no rescue.
Crossover onto retinal PDE6 is milder here than with sildenafil, so the blue-room story is less common. The clinically relevant crossover is cardiac repolarisation. That is the footnote I will not bury under a potency boast.
Nitrates still flood the same nitric-oxide path. Add vardenafil and cyclic GMP accumulates across the vascular tree. Profound hypotension is not a 'use with care' line. It is a never. Riociguat sits in the same never column.
Fat on the plate, 30-to-60-minute peak, 4-5 hour exit
Fasted Tmax is roughly 30 to 60 minutes for the swallowed tablet. Half-life runs about four to five hours. The working window is several hours, not tadalafil's day-and-a-half. For a man who wants a drug that is in and out on a known clock, that is a feature.
High-fat meals blunt Cmax - published drops run in the high teens to about half, depending on the meal - and slow the onset. A light plate is much less of a problem. The day-to-day food and hour-mark detail is in the journal note on fat, grapefruit, and the hour mark for 10 or 20 mg.
CYP3A4 is the main metabolic door, with a smaller CYP2C share. Strong inhibitors force a hard cap - 2.5 mg, and with ritonavir a 72-hour gap. Moderate inhibitors such as erythromycin cap at 5 mg. Inducers can hollow out the effect. Protein binding is about 95 percent. Exit is mostly faecal.
Class IA and III stay off the list; nitrates still kill
| Interacting agent | Concern | Practical step |
|---|---|---|
| Nitrates / nitrites / riociguat | Profound hypotension | Absolute contraindication |
| Class IA / III antiarrhythmics; congenital long QT | Additive QT prolongation | Avoid vardenafil; pick another PDE5 if nitrates are clear |
| Strong CYP3A4 inhibitors | Raised exposure and a larger QT nudge | Cap at 2.5 mg or avoid; ritonavir 2.5 mg / 72 h |
| Alpha-blockers | Additive hypotension | Stable alpha dose, low vardenafil open, separate timing |
Quinidine and procainamide (Class IA) and amiodarone and sotalol (Class III) are the named avoid pair with vardenafil. Congenital long QT is the other named avoid. If those are on the chart, I write sildenafil or tadalafil after I have still cleared nitrates, not a 'small' 5 mg Levitra as a compromise.
Alpha-blockers add hypotension. Start low, separate the peaks, and name the exact prostate drug. Strong CYP3A4 inhibitors are a dose-cap problem and a QT-amplifying problem at the same time, which is why this desk is stricter here than on sildenafil.
Nitrates and nitrites remain a lethal stack. A man who took vardenafil and then develops chest pain must tell the emergency desk the drug name before anyone reaches for nitroglycerin. No interval on a blog makes that pair safe.
Headache is loud; the QT change is quiet
Flushing, a stuffy nose, dyspepsia, and headache are the everyday list, same vasodilator family as the rest of the class. They usually fade as the dose settles. They are not the reason this molecule has its own page on this desk.
QT prolongation does not announce itself with a flavour or a colour. It is why I ask about fainting, family sudden death, and the rhythm bottle before I ask about weekends. Electrolyte chaos - low potassium, low magnesium - is a bad week to add any QT-active drug.
Priapism past four hours, sudden monocular vision loss, and sudden hearing loss are class emergencies. Fitness for sex is still a stairs question. Vardenafil adds a second cardiac question on top of that one. Both have to be green before the cart.
Who opens at 5 mg, who should walk past the molecule
| Situation | Typical swallow | Desk note |
|---|---|---|
| Usual ED open | 10 mg ~60 min ahead | Once daily maximum; avoid a high-fat meal |
| Range | 5-20 mg on demand | Many men never need 20 mg |
| 5 mg first | 5 mg | Age ≥65, moderate hepatic impairment, moderate CYP3A4 inhibitors |
| Staxyn ODT | 10 mg on the tongue | Not interchangeable with 10 mg film-coat |
Men 65 and older, and men with moderate hepatic impairment, often start at 5 mg. Severe hepatic impairment is a reason to avoid. Renal impairment matters less than it does for some drugs, because the kidney is a smaller exit, but I still read the list.
Anyone already on a moderate CYP3A4 inhibitor starts at or below 5 mg. Anyone on a strong inhibitor is in the 2.5 mg / long-gap room or off the drug. That is label, not timidity.
Women and children are not an ED population for this tablet. The population question that is special here is electrical: a personal or family arrhythmia story, a QT-active list, or a congenital long-QT diagnosis. Those men get a different PDE5, or no PDE5, after a clinician who knows their heart has spoken.
What we post after the QT flag
Vardenafil is a short-clock PDE5 inhibitor that works when arousal is present and the plate is not a grease pit. 10 mg is the usual open. 20 mg is a later climb. 5 mg is a first swallow in the rooms the label already named.
The distinguishing sentence is QT. Clear congenital long QT and the Class IA / III list, or pick a cousin. Clear nitrates and riociguat, or pick nothing in the class. Then, and only then, a six-pack cash band is a reasonable question.
Head-to-head efficacy against sildenafil is not why I choose this tablet. I choose it when a man already did well on it, or when a cousin's side-effect profile was the problem, and the tracing is clean. The evidence folder is in the journal note on 10-20 mg reviews versus the QT flag.