Why do you care about my ECG before you will price 5 or 20 mg?
Levitra 5 or 20 mg prescription cost waits on the QT point
The hold is the QT line. Dinner is the second mark. 5 or 20 mg is what you write after both are clean.
Other PDE5 pages on this desk open with food or a half-life. This one opens with a rhythm sheet, then dinner, then a price. A thorough-QT study in 59 healthy men showed that therapeutic 10 mg and supratherapeutic 80 mg vardenafil prolonged QTc in the same neighborhood as moxifloxacin 400 mg. A later combination study showed an additive QT effect when vardenafil sat next to another QT-active drug. That is label, not folklore.
Patients on Class IA agents (quinidine, procainamide) or Class III agents (amiodarone, sotalol), and patients with congenital QT prolongation, should avoid vardenafil - film-coated and Staxyn alike. I also pause when the family history is sudden death at a young age and no one has ever printed an ECG. Sildenafil does not carry this line. That is often the cleaner point when the rhythm list is dirty.
Only after the QT hold is clear do I name 5 or 20 mg, and only after dinner is honest do I talk cost. SERP on this site locks that pair because those are the labeled step-down and step-up from the usual 10 mg start. Do not read a 20 mg × 10 quote as permission to skip the ECG question. The endpoint review keeps the QT paragraph next to the IIEF numbers.
The labeled pair is 5 or 20, not a 2.5 bargain hunt
Film-coated Levitra strengths are 2.5, 5, 10, and 20 mg. Most men without a hold start at 10 mg about 60 minutes before activity. Step to 20 mg if 10 mg is tolerated and still thin. Drop to 5 mg if side effects dominate, if you are 65 or over, or if moderate hepatic impairment (Child-Pugh B) is on the sheet. Once per day is the ceiling. Do not redose the same evening hoping the second peak will behave.
2.5 mg is still the labeled cap with ritonavir (no more than 2.5 mg in 72 hours), and with indinavir, saquinavir, atazanavir, ketoconazole 400 mg daily, itraconazole 400 mg daily, or clarithromycin (no more than 2.5 mg in 24 hours). Ketoconazole 200 mg daily, itraconazole 200 mg daily, or erythromycin: 5 mg in 24 hours is the cap. Those exception chips do not move the SERP lock. This blotter prices 5 or 20 mg after a clean rhythm sheet.
Sexual stimulation is still required. A 20 mg tablet will not invent desire. A 5 mg tablet in an older man is a safety start, not a potency contest. If the QT line is dirty, none of these milligrams are the point - move the class.
Dinner still owns the peak after the rhythm sheet is clean
Absolute bioavailability is about 15 percent. Fasted Tmax after 20 mg sits between 30 minutes and 2 hours, median 60 minutes. Half-life is about 4 to 5 hours. Same-evening drug. Dose about 60 minutes ahead. This is not tadalafil's long tail and it is not a next-morning cover.
High-fat meals are the PK hold I teach before the first fill. Cmax fell 18 to 50 percent across the food-effect work. Some men feel a late, weaker peak. Some feel nothing useful. The tablet can be taken with or without food per the label. The honest counseling line is still: keep fat down or dose earlier. Write it where the patient will see it.
Age 65 and over: mean Cmax about 34 percent higher, AUC about 52 percent higher - hence the 5 mg start I consider in that group. Child-Pugh B after 10 mg: Cmax +130 percent, AUC +160 percent. Severe hepatic disease is not a casual start. The light-plate guide is the kitchen companion to this point.
Wuppertal's second PDE5 still needs an ECG history
Late 1990s
Bayer develops vardenafil as a potent second-generation PDE5 inhibitor.
2001-02
Phase III ED diaries report placebo-separated benefit across mixed causes.
2003
FDA approves Levitra in August; Bayer and GSK co-market.
2010
Staxyn 10 mg orally disintegrating tablet approved - not interchangeable with Levitra 10 mg.
late 2010s
Patents lapse; generic 2.5, 5, 10, and 20 mg film-coated tablets become routine.
After 1998 the target was proven. Bayer did not need an angina accident. It needed a potent, selective PDE5 inhibitor with its own food and cardiac footnotes. Phase III diaries closed around 2001-02. FDA approved Levitra in August 2003, co-marketed with GSK, as the second US oral PDE5 tablet.
The Wuppertal origin note is the chemistry and the launch. The desk takeaway is narrower: this molecule arrived with a QT paragraph sildenafil never needed, and with a food cut that is easier to feel at home than in a protocol kitchen. Generic film-coated vardenafil later filled the same 2.5 / 5 / 10 / 20 mg ladder. The interaction checklist did not get simpler.
Staxyn arrived in 2010 as a 10 mg orally disintegrating option. Useful for men who cannot swallow a tablet or want a water-free dose. It did not erase the QT line. It did not create a 5 mg ODT. It is a different exposure, not a discreet upgrade to 20 mg.
Staxyn melts; it does not become 5 or 20 mg
Staxyn is vardenafil 10 mg as an orally disintegrating tablet. Place it on the tongue. No water. Do not push it into a Levitra 10 mg slot and call the milligrams equal. The Staxyn label says it is not interchangeable with film-coated 10 mg because systemic exposure runs higher.
Staxyn cannot deliver the 5 mg start this desk uses in older men, moderate hepatic impairment, or mid-range CYP3A4 stacks. It also cannot deliver 20 mg. If you need those marks, you need a film-coated tablet. If you want discretion and you are a candidate for a fixed 10 mg ODT, Staxyn is a formulation choice, not a stronger drug.
Food still matters. High-fat meals cut film-coated Cmax by 18 to 50 percent in the two food-effect studies. Staxyn is also food-sensitive. I still write 'light stomach, about an hour' on the instruction line. The dissolve-on-the-tongue trick does not cancel dinner.
Fifteen percent bioavailability and a four-to-five-hour tail
Absorption
Oral; bioavailability ~15 percent. Fasted Tmax 30 min to 2 h, median 60. High-fat Cmax cut 18-50 percent.
Distribution
Vss ~208 L; ~95 percent protein-bound; extensive tissue distribution.
Metabolism
Hepatic CYP3A4 major, CYP3A5 and CYP2C minor. Ritonavir can raise AUC ~49-fold.
Excretion
Mostly fecal metabolites; small urinary fraction; half-life ~4 to 5 hours (longer with ritonavir).
Low absolute bioavailability is why this molecule feels food-sensitive at home. Fasted Tmax after 20 mg sits between 30 minutes and 2 hours, median 60. Half-life about 4 to 5 hours. Dose about 60 minutes ahead. Same-evening coverage. Not a next-morning cover.
Metabolism is mostly CYP3A4, with CYP3A5 and CYP2C help. Protein binding about 95 percent. Vss about 208 L. Metabolites leave mostly in feces (about 91 to 95 percent in label language). Ritonavir can raise AUC about 49-fold and stretch half-life to about 26 hours - that is why 2.5 mg in 72 hours is the cap, not a kitchen-split 20 mg.
Age and liver change the start. Sixty-five and over: consider 5 mg first. Child-Pugh B: start 5 mg, max 10 mg. Those are labeled moves, not coupon tricks. A 20 mg tablet in that group is a later step, not a first reflex.
Class IA, Class III, and the nitrate stop that still wins
| Hold or stack | What the label showed | Desk move |
|---|---|---|
| Any nitrate or nitrite | Potentiated hypotension | Absolute stop; 24-hour gap after a dose |
| Class IA / III antiarrhythmics | Additive QT prolongation | Avoid vardenafil; pick another PDE5 |
| Congenital long-QT | Arrhythmia risk | Avoid |
| Ritonavir | AUC ~49-fold; t½ ~26 h | 2.5 mg; nothing else for 72 hours |
| High-dose azoles / several PIs / clarithromycin | Large Cmax and AUC rises | 2.5 mg in 24 hours |
| Erythromycin / lower-dose azoles | 4-fold-range AUC rises | 5 mg in 24 hours |
| Alpha-blockers | Additive hypotension | Stable first, start low, stagger clocks |
Nitrates remain an absolute contraindication - nitroglycerin, isosorbide, poppers, any nitric-oxide donor. Same 24-hour gap after a dose. Same duty to tell EMS. This is not the distinguishing hold. The distinguishing hold is the antiarrhythmic list.
Avoid vardenafil with Class IA (quinidine, procainamide) and Class III (amiodarone, sotalol) agents, and in congenital long-QT. I also stay away when another QT-prolonging drug is already loaded and the ECG is unknown. A postmarketing combination study showed additivity. I do not run that experiment at home.
Alpha-blockers still add hypotension. Stabilize first, start low (5 mg, or 2.5 mg with certain CYP3A4 inhibitors), separate clocks. Terazosin plus simultaneous vardenafil produced enough standing-pressure outliers that one study arm was stopped. Tamsulosin was kinder in the dedicated work, which is not permission to ignore the stack. Riociguat is contraindicated. Do not stack PDE5 inhibitors.
Phase III scores never cancelled the QT paragraph
Placebo-controlled programs used IIEF and intercourse diaries, the same skeleton sildenafil used. Vardenafil beat placebo across vascular, diabetic, and post-prostatectomy groups. Response bands sat roughly 65 to 80 percent depending on the population. Harder groups responded less. That is not a reason to promise 20 mg will outperform a well-taken 50 mg of sildenafil.
In-vitro potency talk misleads patients. A tighter IC50 on a gel does not mean a better Saturday. Head-to-head clinical gaps are small. Choice is the QT line, the food cut, the formulation, and which tablet the man in front of you actually responded to.
Food-sensitive PK widens the gap between protocol success and a heavy dinner. When a man says the pamphlet worked and his kitchen did not, I ask about the plate before I raise 10 mg to 20 mg. Several fair trials - light stomach, about an hour, real arousal - before anyone declares the class a miss.
Headache is expected; a skipped beat is a stop
Expect the vasodilator list: headache, flushing, rhinitis, dyspepsia, occasional nausea. Dose effect showed up in the trials - more of those events as you climb 5 to 10 to 20 mg. They often settle. Drop 20 mg to 10 mg, or 10 mg to 5 mg, before you abandon a working response. Dizziness rises with alcohol and antihypertensives. Stand slowly.
A brief color or brightness change can happen. Sudden vision or hearing loss is a stop-and-evaluate event, same as the rest of the class. Priapism past four hours is an emergency. Sickle cell disease, myeloma, and leukemia raise that baseline - warn before the first tablet and give a clear ER line.
Palpitations, syncope, or a family story of sudden death send me back to the QT hold, not to a higher chip. In a structurally normal heart with a clean list, the QT effect is usually quiet. On amiodarone it is not a trivia item. I would rather switch the PDE5 than explain a pause in the bay.
Ten 20 mg tablets at four chain counters
| Counter | What public cards showed nearby | 10 × 20 mg read |
|---|---|---|
| CVS Pharmacy | GoodRx Companion printed ~$37.81; SingleCare printed ~$114.10 for 10 × 20 mg - two different cards | Compare both cards at the register; do not assume the higher print is the only cash |
| Walmart Pharmacy | GoodRx Companion ~$43.12 at Neighborhood Market; SingleCare ~$61.09 for 10 × 20 mg | 10-count is the posted default; ask which card the register will honor tonight |
| Albertsons Pharmacy | SingleCare printed ~$72.07 for 10 × 20 mg; grocery-family cash often sits between warehouse and drugstore | Ask Albertsons pharmacy for cash versus the card; ZIP moves the print |
| Kroger Pharmacy | WellRx printed ~$39.93; SingleCare printed ~$131.72 for 10 × 20 mg - again two cards | Bring both prints; grocery cash is often the cheaper of the pair |
This point does not sell. The 20 mg × 10 count is the fill we track because it matches a short as-needed month on the high end of the 5-or-20 lock, and because public cards actually print that quantity. Nearby published figures: GoodRx listed about $44.21 coupon versus about $573.78 retail for 10 × 20 mg. SingleCare printed about $39.11 as a low 10 × 20 mg coupon. We will not invent a dollar the card did not show.
Notice the per-tablet band. Generic 20 mg is cheaper than generic 2.5 mg on the same cards - GoodRx's 2.5 mg × 30 coupon print sat near $289 - which is why a 'cheap Levitra' ad that pushes the floor chip is often the expensive SKU. Ask the counter which card they honor. Warehouse and grocery desks usually beat drugstore cash. Ask before you assume.
Crossing from a 50 mg diamond without stacking evenings
A partial sildenafil response can improve after a switch if the first drug was taken fairly and the hold list is clean. Wash out the first PDE5 before you start the second. Stacking two short-acting tablets is not a titration. It is two vasodilators on one evening.
If the sildenafil miss was food or missing arousal, fix those before you change molecules. If the miss was a dirty QT list you somehow ignored, do not 'try Levitra.' Stay on sildenafil or move to tadalafil. If the man wants a long, unplanned window, tadalafil is the cleaner point anyway - vardenafil will not grow a 36-hour tail.
Staxyn is a reason to pick this INN only when the ODT itself is the point and the QT line is clean. It is not a reason to abandon a working sildenafil 50 mg. Document why you switched. The next clinician should not have to guess.
Sofia's point: QT, then dinner, then 5 or 20
Write four lines before the chip: nitrate status, QT and antiarrhythmic list, dinner plan, starting milligram. If the second line is dirty, stop. If the list is clean and you are 65 or over, 5 mg is the usual first film-coated tablet. If the list is clean and 10 mg was thin, 20 mg is the step-up, not a first reflex.
Judge the point after several evenings that followed the holds - QT line clean, dinner honest, about an hour, real arousal, one tablet. Then step 10 to 20 or down to 5. This page is a Portland dose point. It is not a cart, and a 20 mg × 10 quote is not an invitation to skip the rhythm sheet.
Mail on this compound clusters around rhythm drugs, the 5 or 20 mg pair, and dinner. I mark the QT line first. I do not fill from a thread.
Because vardenafil prolongs QTc. The thorough-QT work put 10 mg and 80 mg in the same neighborhood as moxifloxacin, and a later study showed additivity with another QT-active drug. If you already take amiodarone, sotalol, quinidine, or procainamide, or if you have congenital long-QT, I will not start this molecule at 5 mg or at 20 mg. I will move you to sildenafil or another PDE5 that does not carry that line. FDA labeling at fda.gov is the sheet I follow. A 20 mg × 10 coupon does not reopen that door.
Sites advertise cheap Levitra. Is 20 mg the dose I should ask for?
Only after a fair 10 mg trial, or if a prior clinician already stepped you there. 20 mg is the labeled ceiling for most men, not the usual first tablet. 5 mg is the start I use when you are 65 or over, Child-Pugh B, or a mid-range CYP3A4 inhibitor is on the list. 2.5 mg is a different object - ritonavir and the high-dose azole caps. Cheap and correct are not the same word on this desk. Most clean lists start at 10 mg, then step to 20 or down to 5.
How much does a heavy dinner actually change a 20 mg peak?
Enough that I teach it before the first fill. High-fat meals cut Cmax by 18 to 50 percent in the food-effect studies. Some men feel a late, weaker rise. Some feel nothing useful. The label says with or without food. My line is still: light stomach, about 60 minutes ahead. Staxyn does not cancel dinner. If last Saturday failed after a late plate, fix the plate before we raise 10 mg to 20 mg. Mayo's patient pages at mayoclinic.org sketch the timing if you want a second voice.
I use a nitrate spray on bad days. Is vardenafil simply off the table?
Yes. Nitrates plus any PDE5 inhibitor can kill - spray, isosorbide, poppers. After vardenafil I keep nitrates off the sheet for at least 24 hours and I tell you to say so in any chest-pain bay. Fix the angina with cardiology first. Then we talk about whether any erectile agent belongs on your list. The QT line does not replace this rule. It sits on top of it. A 5 mg tablet is not a safer nitrate combo. No milligram is.
The dissolving tablet looks easier. Can I just use Staxyn instead of 5 or 20 mg?
No. Staxyn is a fixed 10 mg orally disintegrating tablet. It is not interchangeable with Levitra 10 mg, and it cannot give you a 5 mg start or a 20 mg step-up. If you need the 5 mg start, you need a film-coated 5 mg tablet. If you want a water-free 10 mg dose and your QT line is clean, Staxyn is a formulation choice. It is not a workaround for a CYP3A4 cap or for a dirty rhythm list.
Which side effects mean I stop, and which ones do I just wait out on 20 mg?
Headache, flush, stuffy nose, indigestion - usually wait out or step down a chip, 20 mg to 10 mg or 10 mg to 5 mg. Brief color change, same. Stop and get care for an erection past four hours, sudden vision or hearing loss, syncope, or new palpitations. The last two send me back to the QT hold, not to a pep talk. Most men only see the mild list. Symptom language on medlineplus.gov is fine for the mild list. Emergencies go to a bay, not a search bar.
I take tamsulosin and a calcium-channel blocker. Where do you start - 5 or 20?
I stabilize those first. Then I start vardenafil low - 5 mg, or 2.5 mg if a CYP3A4 inhibitor is also on the list - and I stagger the clocks. Dedicated tamsulosin work was kinder than terazosin, which produced enough standing-pressure outliers that one simultaneous-dose arm was stopped. That history is why I still separate the hours. 20 mg is not the opening chip on that stack. Bring every clinic's list. Heart-risk primer at heart.org if you want reading. I still want to see you.
It worked on a Tuesday and failed on Saturday. Is the 20 mg batch bad?
Usually the Saturday was the batch - late dinner, more alcohol, less actual arousal, or a tablet taken at the wrong hour. Retry about 60 minutes ahead, lighter plate, real stimulation, several times, before we change milligrams. Then 10 mg to 20 mg if the effect is thin and the side effects are quiet. Top dose still failing means testosterone, glucose, vessels, or a different PDE5 - not a second tablet the same night. I will not chase a 'bad lot' story until the kitchen is honest.
How is this different from sildenafil if the clock looks the same?
Clock is similar: about 30 to 60 minutes on, about four to five hours out. Neither matches tadalafil's long window. Vardenafil hits food harder - Cmax cut 18 to 50 percent - and carries the QT line sildenafil does not. For a healthy man with a clean list, choice is which tablet you responded to. For a man on amiodarone, the choice is already made. Background on the class at medlineplus.gov. Switch after a fair trial. Do not stack a 50 mg diamond and a 20 mg film-coated tablet on one evening.
I am 68. Do you still open at 20 mg?
I usually do not. Mean Cmax ran about 34 percent higher and AUC about 52 percent higher in men 65 and over. I consider 5 mg as the first film-coated tablet, then step if it is tolerated and thin. If a CYP3A4 inhibitor is also on the list, we may already be at 2.5 mg. Age alone is not a QT ban. Age plus amiodarone is. I want the full list, not just your birthday. 20 mg is a later conversation after 5 mg and 10 mg have had fair nights.
I am on ritonavir. Someone said just take a tiny piece of a 20 mg tablet.
I will not dose you with a kitchen knife. The label writes a 2.5 mg film-coated tablet, and nothing else for 72 hours, because ritonavir raised vardenafil AUC about 49-fold and stretched half-life to about 26 hours. Breaking a 20 mg tablet is not that instruction. If 2.5 mg film-coated is not in stock, we pick another PDE5 with a ritonavir rule we can actually fill. We do not improvise an eighth-tablet and hope the QT line stays quiet.
My uncle died suddenly at 41. I have never had an ECG. Still okay to start 5 mg?
Not until someone prints a tracing and we talk about congenital long-QT. A family sudden-death story is exactly the history the QT paragraph is for. I would rather delay a first tablet than discover the syndrome after a 5 mg or 10 mg dose. If the ECG is clean and no antiarrhythmic is on the list, we can still talk about vardenafil. If it is not, we move the class. 5 mg is not a stealth dose past that row.
Kroger will fill 20 mg cheaper than my drugstore. Is a grocery counter fine?
Licensed grocery pharmacy that checks a real prescription is a legitimate counter - Kroger, Albertsons, Walmart, and CVS are in the table for that reason. A site that ships 20 mg without a script, or at a price that ignores how the public cards actually print, is not that counter. Compare the ~$44 / 10 GoodRx print and the ~$39 SingleCare low against what the register honors, then decide with a pharmacist you can name. I do not fill from a thread. I will tell you which hold to mark before you walk in.
General education from a clinician, not personal medical advice. Bring your own history to your own prescriber.
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