Ceiling 20 mg and the paper that mentions QT
Levitra's labelled start for most men is 10 mg about 60 minutes before activity, then up to 20 mg or down to 5 mg. Brynza files the ceiling because that is the blister men share, and because the adverse list already carries a dose effect on the complaints that make people quit.
Before any 20 mg talk: congenital long QT, class IA or III antiarrhythmics, nitrates, riociguat. The QT set sidebar is the short ECG sheet. This column is the full adverse proof.
Stimulation is required. Vardenafil is a PDE5 inhibitor, not a desire switch. Absolute oral bioavailability is about 15%. Fasted Tmax after 20 mg sits between 30 minutes and 2 hours, median 60 minutes.
Discontinuation for adverse events in placebo-controlled trials was 3.4% on vardenafil and 1.1% on placebo. That is the 'will I have to stop?' number. It is not a safety holiday.
Stimulation still has to arrive. Fifteen percent bioavailability means a large first-pass. Men who swallow 20 mg at the cloakroom and expect a switch at 15 minutes are fighting Tmax, not a broken batch. Median peak after 20 mg fasted is 60 minutes, range 30 minutes to 2 hours.
Polish boxes may say Levitra, Vivanza in older EU talk, or a generic vardenafil. Set the INN. Staxyn stays a different formulation. This ceiling lock is the film-coated 20 mg tablet only.
A man who arrives with a friend's 20 mg strip and a clean list still needs the start conversation: 10 mg for most, 5 mg if he is 65 or on an alpha-blocker. The lock on this page is the ceiling he must not treat as a first swallow. Side effects that climb with the milligram are the reason.
Headache, flush, and rhinitis climb with the milligrams
When Levitra was taken as recommended, placebo-controlled trials of 5, 10, or 20 mg reported the pooled rates below (vardenafil n=2203, placebo n=1199). Flexible-dose arms started at 10 mg and allowed a step to 5 or 20.
The PI says placebo-controlled trials suggested a dose effect for headache, flushing, dyspepsia, nausea, and rhinitis across 5, 10, and 20 mg. That sentence is why a man who was comfortable at 10 should not treat 20 as a free upgrade. Back pain is not tadalafil's delayed lumbar story here - 2.0% versus 1.7% placebo.
Over 4430 men received vardenafil in the broader trial pool (mean age 56). More than 2200 were treated at least 6 months; 880 at least a year. Duration on drug does not erase the first-dose flush at the ceiling.
Sinusitis 3% versus 1% and flu syndrome 3% versus 2% sit next to rhinitis. A week of coloured discharge and fever is infection work. A stuffy evening every time the 20 mg tablet goes down is the dose-effect row. Dizziness 2% versus 1% - pair it with the 7/8 mmHg supine drop, not with an inner-ear story, until someone has measured standing pressure.
Accidental injury was 3% versus 2% and the footnote says it was not called an adverse drug reaction. Do not build a 'Levitra makes you clumsy' sermon from that cell. CK increase 2% versus 1% is a lab nudge; repeat it with symptoms before anyone stops a useful tablet.
| Reaction | Placebo (n=1199) | Vardenafil 5/10/20 (n=2203) |
|---|---|---|
| Headache | 4% | 15% |
| Flushing | 1% | 11% |
| Rhinitis | 3% | 9% |
| Dyspepsia | 1% | 4% |
| Sinusitis | 1% | 3% |
| Flu syndrome | 2% | 3% |
| Dizziness | 1% | 2% |
| CK increase | 1% | 2% |
| Nausea | 1% | 2% |
| Back pain | 1.7% | 2.0% |
Why 20 is a ceiling, not a first swallow
Elderly men in Phase 3 did not show a different safety story at 5, 10, or 20 mg versus younger men, but concentrations run higher, so the start is still 5 mg to consider. Moderate hepatic impairment after 10 mg: Cmax +130%, AUC +160%. The maximum there is 10 mg. A 20 mg ceiling lock is for men whose liver row is clean.
The onset issue sidebar covers the median-60-minute peak so a man does not swallow 20 mg at the door and declare failure at 20 minutes.
| Situation | Labelled vardenafil | Brynza note |
|---|---|---|
| Usual start | 10 mg PRN, ~60 min before | Then 5 or 20 by effect/AE |
| This lock | 20 mg PRN | Ceiling; once / 24 h |
| Age ≥65 | Consider 5 mg start | Cmax +34%, AUC +52% vs 18-45 y |
| Alpha-blocker, stable | Start 5 mg | Not 20 on night one |
| Child-Pugh B | Start 5 mg; max 10 mg | 20 mg is off this lane |
| Child-Pugh C | Do not use | Not studied as a home dose |
| Ritonavir | 2.5 mg; not again for 72 h | AUC 49-fold at the 5 mg study dose |
| Indinavir | 2.5 mg / 24 h | AUC 16-fold at 10 mg |
Orally disintegrating Levitra is a different tablet
Staxyn has its own food, water, and bioequivalence story. This cash band and this adverse table belong to the swallowed 20 mg film-coated tablet. Say the formulation aloud at the window.
| INN | vardenafil hydrochloride |
|---|---|
| This lock | Film-coated 20 mg tablet (Levitra generics) |
| ODT brand | Staxyn - not interchangeable by habit |
| Usual start (tablet) | 10 mg; ceiling 20 mg |
| First US approval | 2003 |
| Class | PDE5 inhibitor |
One 20 mg tablet, and what a redose invents
Maximum frequency is once per day. A second 20 mg because the first met bigos invents a Cmax the food study already cut by 18-50%, then doubles the rhinitis-and-flush tax. Wait for the next calendar day. Or pick a fasted 10 mg trial.
Elderly Phase 3 used 5, 10, and 20 mg in more than 834 men without a different headline safety split versus younger men. Concentrations still ran higher. That is why the start is conservative and this lock stays a ceiling. Skipping to 20 mg on night one in a 68-year-old is the pattern this column was written to stop.
Bleeding disorders and active peptic ulcer need a benefit-risk talk. Vardenafil 10 and 20 mg did not add to aspirin bleeding time. That pair study is not a clearance for a man who already bleeds. Do not file it as one.
If PAH tadalafil or sildenafil is already on the list, this 20 mg ED tablet is a class stack. Pulmonary teams own that conflict. A different box colour does not make a different enzyme.
Nifedipine 30 or 60 mg slow-release plus vardenafil 20 mg did not change nifedipine AUC or Cmax. The extra supine drop was 6/5 mmHg. Controlled hypertension is not a free 20 mg start if an alpha-blocker is also on the list. Two vasodilator stories still add.
Print the QT set beside the first fill. Print the onset issue so the cloakroom swallow is not judged at 15 minutes. Then send the man back to the prescriber if flush or rhinitis at 20 mg is the only complaint - a step down to 10 mg is labelled, and this desk prefers it to a silent quit.
Hospital reconciliation should list vardenafil next to antiarrhythmics so a night admission does not add a class III drug on top of a ceiling tablet, or the reverse. Last swallow time belongs on the note. Half-life 4-5 hours in a clean list is not the 26-hour ritonavir story.
Compare daily tadalafil 2.5 mg if the man will never fast and will accept next-day lumbar ache. Compare sildenafil 25 mg if a short window and a 10% flush tax are acceptable. The matrix is the fingerprint sheet, not a permission to stack.
Ten-count cash band for the ceiling tablet
Generic vardenafil 20 mg × 10 is the priced lock. Staxyn ODT is not this tablet. QT screen first. Brynza does not dispense.
GoodRx cells in the caption are dated 06 July 2026 on that table. Each href is the named chain's pharmacy page. Ask the window for the INN on the script.
Generic vardenafil 20 mg x 10, GoodRx Levitra table, 06 July 2026.
Generic vardenafil 20 mg, ten tablets, the Brynza ceiling column, 21 August 2026. GoodRx Levitra table lists 20 mg x 10 at $573.78 average retail and $44.21 with a coupon (06 July 2026). Staxyn ODT is not this tablet. QT first. Brynza does not dispense.
Ten milligrams versus eighty versus moxifloxacin
A dedicated study in 59 healthy men measured QT at about one hour - the usual peak. Therapeutic vardenafil 10 mg and a supratherapeutic 80 mg dose produced QTc increases in the same conversation as moxifloxacin 400 mg, the positive control. A later postmarketing study that combined vardenafil with another QT-active drug showed an additive effect.
The clinical instruction is blunt. Patients with congenital QT prolongation, or who take class IA or class III antiarrhythmics, should avoid vardenafil. This is not 'get an ECG sometime'. It is a pre-issue screen. Amiodarone, sotalol, quinidine, procainamide: the list the cardiologist already knows.
Do not read the study as '20 mg causes torsades in healthy men'. Read it as paperwork the other two oral PDE5 inhibitors do not carry at this volume. The QT set is the pocket version.
Moxifloxacin is in the study because regulators use it as a positive control, not because someone should take both. Combining vardenafil with another QT-active drug added more interval. That is the postmarketing sentence. A 'normal ECG last spring' does not retire amiodarone or sotalol from the avoid list.
If the only cardiac drug is a beta-blocker for blood pressure, that is not automatically class III. Read the box. Guessing the class from the colour of the blister is how locums miss sotalol.
High-fat meals cut Cmax 18 to 50 percent
Two food-effect studies produced that 18-50% Cmax range. A heavy Polish dinner can turn a 20 mg ceiling into a weaker, later peak - then the man redoses. One tablet per 24 hours. Fix the plate or pick daily tadalafil 2.5 mg if meals never move.
Vardenafil 20 mg with alcohol 0.5 g/kg in healthy volunteers did not potentiate hypotension over 4 hours and did not change alcohol or vardenafil levels. That is a study, not a licence to drink through dizziness. Standing pressure still wins.
M1 is an active metabolite. Protein binding about 95% for parent and M1 is reversible. Volume of distribution about 208 L says the drug leaves plasma into tissue. A mean 0.00018% of a 20 mg dose appeared in semen at 1.5 hours. None of that is a fertility claim.
Cimetidine 400 mg twice daily did not change vardenafil AUC or Cmax after 20 mg in healthy volunteers. That pair is not a free pass for every OTC acid drug in a man with Child-Pugh B, where the maximum is already 10 mg.
The highest human dose in the file is a single 120 mg swallow in healthy volunteers. Most of them had reversible back pain or myalgia and/or abnormal vision. That is an overdose portrait, not a titration target.
| Absorption | Absolute bioavailability ~15%. Fasted Tmax after 20 mg: 30 min-2 h (median 60 min). High-fat meals: Cmax -18% to -50%. |
|---|---|
| Distribution | Vss ~208 L. Parent and M1 ~95% protein bound. 0.00018% of a 20 mg dose in semen at 1.5 h. |
| Metabolism | CYP3A4 major; CYP3A5 and CYP2C9 contribute. M1 is an active metabolite. |
| Excretion | Terminal t½ typically 4-5 h. Ritonavir stretched t½ to 26 h in the interaction study. |
Five milligrams first if the alpha-blocker is already running
Start vardenafil at 5 mg in men stable on an alpha-blocker. A 20 mg first night on terazosin is how outlier standing systolic values appear. One tamsulosin/terazosin pharmacology program stopped an arm when simultaneous Tmax produced too many standing SBP readings under 85 mmHg.
Single 20 mg doses in men with ED dropped supine pressure about 7 mmHg systolic and 8 mmHg diastolic versus placebo, with heart rate up about 4 bpm, worst between 1 and 4 hours. Day 31 of daily experimental dosing looked like day 1. Nifedipine-controlled men saw an extra 6/5 mmHg supine drop after vardenafil 20 mg.
Nitrates remain contraindicated. Sublingual 0.4 mg nitroglycerin 1 and 4 hours after vardenafil 20 mg potentiated the pressure drop in healthy middle-aged men. At 24 hours that pair no longer showed the effect. The contraindication does not become a 24-hour home rule.
Hearing drop, priapism, NAION
Postmarketing hearing events cannot be assigned cleanly to the drug versus baseline risk. The instruction is still stop. In Poland, 112 for collapse or an erection that will not leave. Mail to [email protected] is for sourcing, not for an ECG read.
Compare delayed back on tadalafil 2.5 daily and meal-tied flush on sildenafil 25 mg if the man is choosing a fingerprint, not a billboard colour.
Vardenafil 10 mg and 20 mg did not add to aspirin bleeding time in the labelled pair study. Active peptic ulcer or a bleeding disorder still needs a benefit-risk talk the PI asks for. Do not clear those men from a column.
Mild hepatic impairment after 10 mg: Cmax +22%, AUC +17%. No cut required on that row. The jump to Child-Pugh B is the one that blocks this 20 mg lock. Write the class on the chart, not a memory of 'a bit of liver'.
Stop list at the 20 mg ceiling
- Erection past 4 hours: emergency care. Painful priapism past 6 hours can destroy tissue.
- Sudden hearing decrease or loss, sometimes with tinnitus or dizziness: stop all PDE5 inhibitors, seek care.
- Sudden vision loss: stop, urgent eye care. NAION language matches the class.
- Congenital LQTS or class IA/III antiarrhythmic: do not start.
- Highest studied human dose 120 mg: reversible back pain/myalgia and/or abnormal vision in most of those volunteers.
Issue stamp on the ceiling sheet
Levitra 20 mg is filed here as a side-effect ceiling: dose-climbing flush and rhinitis, a real QT paper, and a formulation trap named Staxyn. Pair the QT and onset sidebars, then the PDE5 matrix.
Prescriber owns the script. This desk owns the proof. 112 if someone is collapsing. Mail a drifted QT sentence to [email protected] - not an ECG.
Sources
- DailyMed vardenafil / Levitra tablet labels - Table of ≥2% AE, QT 5.7/12.2, dose-effect sentence
- Levitra US PI - 20 mg BP -7/-8 mmHg; high-fat Cmax -18% to -50%; ritonavir 49-fold AUC, 2.5 mg / 72 h
- QT study in 59 healthy men - 10 mg and 80 mg versus moxifloxacin 400 mg
- GoodRx Levitra table 20 mg x 10 cash band in the fill caption only (06 July 2026 cells)
Checked against the current label and reviewed by Dr. Tomasz Krajewski. See Brief, Set, Proof, Issue.