MedVi Quad Review: Do the 4-in-1 ED Drops Actually Work?
Quad is a compounded sublingual liquid — four active ingredients in one dose you hold under your tongue. MedVi changed what is in it in 2026, and most reviews still describe the old formula.
Quad’s 4-in-1 liquid is real prescription medicine, not a supplement — but MedVi changed the formula in 2026, and one of the four ingredients has never been FDA-approved for men. That one fact decides whether it belongs in your medicine cabinet.
- The current formula is sildenafil, tadalafil, PT-141 and L-citrulline. The earlier version used vardenafil and apomorphine instead of PT-141 and L-citrulline, so older reviews describe a different product.
- PT-141 (bremelanotide) is FDA-approved only as an injection for premenopausal women with low sexual desire. Using it for erectile dysfunction in men is off-label, by a route the FDA has not approved. [accessdata.fda.gov]
- The combination itself is compounded, which means no regulator has reviewed this specific mixture for safety, effectiveness or quality.
Disclosure: Rx.com earns a commission if you start treatment through links on this page. It does not change what we write — this review names the parts of Quad we could not verify, and the parts we think are weak.
What MedVi Quad Is
Quad is a compounded, prescription-only liquid that puts four active ingredients into a single dose you hold under your tongue rather than swallow. A compounding pharmacy mixes it to a prescriber’s order after an online health evaluation, and it ships to you directly. You will see it called Quad, QUAD by MEDVi, quad ED drops, male enhancement drops or — from people going by the sound of it — “quattro.” They are all the same product.
Erectile dysfunction is common enough that a combination product has a market: roughly one in three American men over 40 report some degree of it. [niddk.nih.gov] Quad is aimed at the slice of that group who have already tried a standard pill and were not satisfied — usually because it worked too slowly, or worked but not reliably.
The word doing the most work in that description is compounded. It means the individual ingredients are established drugs, but this particular mixture has not been evaluated by the FDA for safety, effectiveness or manufacturing quality the way an approved product is. That is not the same as illegal, and it is not the same as proven.
Quad ED Drops: What the Liquid Format Actually Changes
The liquid format is the part MedVi markets hardest, and it is the part with the clearest science behind it — though less than the marketing implies.
When you swallow a tablet, it passes through your stomach and then your liver, which breaks down a meaningful share of the dose before it ever reaches your bloodstream. A drug absorbed through the tissue under your tongue skips that first pass. In practice that means two things: it can start working sooner, and a smaller amount of drug can do the same job.
This has been tested directly with sildenafil. In a randomised trial of sublingual sildenafil, a lower sublingual dose produced a faster onset of action than the standard swallowed dose. [pubmed.ncbi.nlm.nih.gov] MedVi states onset in roughly 10 to 15 minutes for most men, versus the roughly one hour a swallowed tablet is usually timed around.
Two practical consequences worth knowing:
- Food matters less. A heavy or fatty meal slows the absorption of a swallowed ED tablet. Sublingual absorption largely sidesteps the digestive tract, so a dinner date is less of a scheduling problem.
- Technique matters more. If you drink the dose down like a shot instead of holding it under your tongue, you have converted it back into a swallowed drug and given away the advantage. MedVi’s instruction is to hold it in place for 30 to 60 seconds before swallowing what remains.
What the format does not do is make the drugs stronger or safer. It is a delivery change, not a potency upgrade.
MedVi Quad Dosage Chart
One point first, because it matters more than any chart: the amount of each ingredient in your Quad is set by your prescriber and printed on your own label. Compounded formulas are adjusted per patient, and MedVi does not publish a fixed strength for every ingredient. Anyone quoting exact milligram figures for Quad without showing you a label is guessing. Read yours, and ask the prescriber if anything is unclear.
What can be stated precisely is how the dose is taken, and what the approved standalone doses of the two PDE5 ingredients look like for reference.
| Step | What to do | Why it matters |
|---|---|---|
| Timing | Take roughly 15 minutes before activity | Sublingual absorption is faster than a swallowed tablet [ref] |
| Administration | Hold the liquid under the tongue 30–60 seconds, then swallow | Swallowing immediately removes the format's whole advantage |
| Frequency | No more than one dose in 24 hours | Tadalafil stays active up to 36 hours, so doses overlap [ref] |
| Re-dosing | Do not take a second dose because the first felt weak | Stacking PDE5 inhibitors compounds the blood-pressure drop |
| Alcohol | Keep it light | Alcohol adds to the same vasodilation the drugs cause |
For reference, here is what the FDA-approved labelling says about the two ingredients in Quad that are approved for erectile dysfunction on their own. These are not the amounts in Quad — they are the benchmark your prescriber is working from.
| Ingredient | Approved adult dose range (standalone) | Approved duration of effect |
|---|---|---|
| Sildenafil | 25 mg, 50 mg or 100 mg as needed [ref] | Around 4 hours |
| Tadalafil | 10 mg as needed, adjustable to 5 mg or 20 mg [ref] | Improves erectile function up to 36 hours post-dose [ref] |
| PT-141 (bremelanotide) | No approved dose for men — approved only as a subcutaneous injection for premenopausal women [ref] | Not established for this use |
| L-citrulline | No approved drug dose — studied as a supplement | Not established |
The dosing question people actually ask: “Can I take Quad every day?” The honest answer is that the tadalafil in it is long-acting, so daily as-needed dosing means overlapping doses. Some prescribers do use low-dose daily tadalafil deliberately — but that is a different plan at a different strength, and it is your prescriber’s call, not a self-adjustment.
See if the 4-in-1 is right for you
Complete an online evaluation with a U.S.-licensed provider and find out whether Quad is appropriate for your health history.
The 2026 Formula Change — What's In It Now
This is the single most important thing on this page, and most of the Quad reviews you will find do not mention it.
Quad’s current formula is sildenafil, tadalafil, PT-141 and L-citrulline. The earlier version of the product combined sildenafil and tadalafil with vardenafil and apomorphine. If you are reading a review that describes apomorphine or a third PDE5 inhibitor, you are reading about a product that is no longer being sold under that name.
Here is what each of the four is actually doing, and it is worth being precise, because the low-quality pages ranking on this term routinely get it wrong.
- Sildenafil — a PDE5 inhibitor. It increases blood flow into the penis and restricts the outflow. This is the ingredient in Viagra, and the evidence behind it is as strong as ED evidence gets. [pubmed.ncbi.nlm.nih.gov]
- Tadalafil — also a PDE5 inhibitor, working the same way but lasting far longer. Its labelling supports improved erectile function up to 36 hours after a dose, which is where the “weekend” framing comes from. [dailymed.nlm.nih.gov]
- PT-141 (bremelanotide) — not a PDE5 inhibitor, despite what several sites claim. It is a melanocortin receptor agonist that acts in the brain rather than on blood vessels, targeting desire rather than blood flow. [pubmed.ncbi.nlm.nih.gov]
- L-citrulline — an amino acid, not a drug. The body converts it to L-arginine, which feeds the nitric oxide pathway that PDE5 inhibitors depend on. [pubmed.ncbi.nlm.nih.gov]
The logic of the stack is coherent: two vascular drugs on different timescales, one central-acting ingredient for desire, and a precursor that supports the same pathway. Whether four ingredients beat two is a different question, and it is the one the evidence does not answer.
Does the Evidence Back Up MedVi's Claims?
Each ingredient has evidence behind it. The combination does not. No peer-reviewed trial has tested this specific four-ingredient sublingual formula against a single-ingredient pill, so nobody — including MedVi — can tell you how much the extra two ingredients add.
What the literature does support:
The PDE5 half is solid. Sildenafil’s original trial programme established the effect clearly, [pubmed.ncbi.nlm.nih.gov] and tadalafil’s onset and duration are well characterised. [pubmed.ncbi.nlm.nih.gov] If Quad works for you, this is the most likely reason.
The PT-141 idea has genuine support — at other doses and other routes. Subcutaneous PT-141 produced dose-dependent erectile activity in healthy men and in men who responded inadequately to Viagra. [pubmed.ncbi.nlm.nih.gov] More directly relevant: combining low-dose intranasal PT-141 with sildenafil produced a significantly greater erectile response than sildenafil alone. [pubmed.ncbi.nlm.nih.gov] That is the strongest published argument for the concept behind Quad. Note the routes: injected and intranasal, not sublingual.
The L-citrulline evidence is thin. The most-cited trial enrolled 24 men with mild ED and found improved erection hardness with no adverse events. [pubmed.ncbi.nlm.nih.gov] Twenty-four men is a pilot, not proof, and mild ED is the easiest case to improve.
Read together: the concept is reasonable and partly evidence-backed, the specific product is not tested, and the burden of that uncertainty sits with you rather than with a regulator.
Is MedVi Quad Legit or a Scam?
It is not a scam. Quad is a genuine compounded prescription medication, prescribed after an evaluation by a U.S.-licensed provider and dispensed by a licensed pharmacy. It is not a supplement sold as if it were medicine, which is the usual shape of an actual ED scam.
That said, “not a scam” is a lower bar than most buyers have in mind. Four things you should weigh with your eyes open:
- The combination is not FDA-approved. Compounded drugs are not reviewed for safety, effectiveness or quality before they reach you. That is a legal category, not an accusation — but it means the usual safety net is absent.
- One ingredient is off-label by an unapproved route. PT-141 is approved only as a subcutaneous injection, for premenopausal women with low sexual desire. [accessdata.fda.gov] Prescribing off-label is legal and routine in medicine, but you should know that is what is happening.
- MedVi has an FDA warning letter. In February 2026 the FDA issued MEDVi, LLC a warning letter over how compounded semaglutide and tirzepatide were marketed on one of its websites, including claims that implied FDA approval. [fda.gov] The letter did not concern Quad or any ED product. It is still a fair signal about how the company markets, and worth reading yourself rather than taking anyone’s summary for it.
- It is a subscription. Recurring billing is the most common complaint theme against telehealth men’s health brands generally. Before you enrol, find the cancellation method in writing and confirm what you will be charged after the first month.
None of that makes Quad a bad choice. It makes it a choice you should make deliberately.
What Real Users Report
We will be straight about the limits here, because this is where most Quad reviews stop being reviews.
There is no verified, independently audited rating for Quad specifically. MedVi as a company has thousands of reviews on Trustpilot, but those cover its whole business — including its weight-loss programme — not this product. We could not verify any Quad-specific score, and you should be sceptical of any page quoting a precise star rating and a tidy percentage of satisfied users without showing you where it came from. An earlier version of this article carried one such figure; we removed it because we could not source it.
What can be said honestly, from the pattern of complaints across telehealth men’s health services and from what the pharmacology predicts:
- The most consistent praise is about speed. That is the claim most likely to hold up, because faster onset is the one benefit of the sublingual route with direct trial support. [pubmed.ncbi.nlm.nih.gov]
- The most consistent complaints are commercial, not clinical. Billing, cancellation friction and price changes after the introductory period dominate negative reviews of this category. Judge the medicine and the merchant separately.
- Side effect reports track the PDE5 ingredients. Headache, flushing and nasal congestion are the expected pattern, and they are the ones to expect here too.
If you want a rating you can trust, look at MedVi’s Trustpilot page directly and read the recent one-star reviews rather than the score. The score is an average across products; the complaints tell you what actually goes wrong.
Side Effects and Safety Checks
Most side effects come from the PDE5 ingredients and are familiar to anyone who has taken an ED pill: headache, facial flushing, nasal congestion and indigestion. They usually pass within a few hours.
The risk that deserves real attention is blood pressure. Sildenafil and tadalafil both lower it, and taking them together in one dose means both effects land at once. If you take any medication that also lowers blood pressure, that interaction is the thing to raise with your prescriber before you start.
| Scenario | Recommended action | Why |
|---|---|---|
| Taking nitrates or poppers | Contraindicated — do not use | Risk of a dangerous drop in blood pressure |
| Taking riociguat | Contraindicated — do not use | Same additive blood-pressure risk |
| On an alpha-blocker for prostate symptoms | Tell your prescriber before starting | Additive low blood pressure and dizziness |
| Significant kidney or liver impairment | Dose adjustment or avoidance | Slower clearance raises drug levels |
| Retinitis pigmentosa | Avoid | PDE5 inhibitors can worsen some retinal disorders |
| Unstable heart disease | Get cardiac clearance first | Sexual activity and vasodilators both stress the heart |
Is Quad a reasonable fit for you?
Check the column that matches your situation:
Likely a good fit
- You have tried a standard single-ingredient pill and the response was slow or incomplete
- Your blood pressure is well controlled and you take no nitrates
- Timing a dose an hour ahead is the part that does not work for you
- You are comfortable with a compounded product that has not been FDA-reviewed
Talk to a doctor first
- Chest pain, arrhythmia, or a recent heart attack or stroke
- Taking nitrates, poppers or riociguat
- History of very low blood pressure
- Severe liver or kidney disease
- Unexplained vision changes
- Any previous erection lasting more than 4 hours
Prescription ED Options
Quad is one format among several, and format is genuinely the thing that differs — the underlying medicines overlap heavily. Worth knowing what your choices actually are:
- A standard tablet, as needed. Sildenafil or tadalafil taken ahead of activity. The most evidence, the most prescriber familiarity, and the widest availability at ordinary pharmacies. Our guide to what generic Viagra involves covers how this route works.
- A low daily dose. Low-dose tadalafil taken every day removes the timing problem entirely, because you are always covered. Our guide to getting tadalafil online walks through how prescribers approach this.
- A sublingual or dissolvable format. What Quad is. Faster onset, less affected by food, and the option that makes most sense if slow onset is your specific complaint.
- A non-drug topical. Eroxon is an applied gel rather than a systemic drug, which changes the interaction picture completely — we compare it in Eroxon vs Viagra.
- Non-drug options. Vacuum erection devices and, for men who do not respond to oral therapy, injections. Unglamorous, but they work when pills do not.
If you are weighing telehealth services rather than medicines, we maintain a comparison of ED treatment websites covering how each handles evaluation, licensing and shipping.
Whichever you choose, the evaluation step is not a formality. ED is frequently the first visible sign of cardiovascular disease, and a prescriber reviewing your history is the part of this process with the most value in it.
Cost and Insurance
MedVi sells Quad as a monthly membership that bundles the online evaluation, the medication and shipping into one recurring charge. Insurance almost never covers compounded ED medication, so this is a cash purchase either way. Check the current price and the cancellation terms on MedVi’s own enrolment page before you commit — introductory pricing and ongoing pricing are not always the same number, and that gap is the most common source of complaints in this category. If cost is the deciding factor, generic single-ingredient tablets are the cheaper route, and a free Rx.com discount card can be used on them at retail pharmacies.
Before you enrol: get three things in writing — what you pay after the first month, how to cancel, and what happens if the medication does not work for you. A legitimate service will state all three plainly.
When to contact your healthcare provider
Seek medical attention promptly if you experience any of the following:
- Chest pain or tightness — may signal cardiac stress while using vasodilators.
- An erection lasting more than 4 hours — priapism is a medical emergency and can cause permanent damage.
- Sudden vision loss or eye pain — rare optic nerve events have been reported with PDE5 inhibitors.
- Sudden hearing loss or ringing in the ears — also reported with this drug class.
- Severe dizziness or fainting — may indicate dangerously low blood pressure.
- Hives, or swelling of the lips or tongue — signs of an allergic reaction.
- New palpitations or irregular heartbeat — especially with known heart disease.
Scientific References
- Goldstein I, et al. Oral sildenafil in the treatment of erectile dysfunction. Sildenafil Study Group. N Engl J Med. 1998;338(20):1397-1404.
- Deveci S, et al. Sublingual sildenafil in the treatment of erectile dysfunction: faster onset of action with less dose. Int J Urol. 2004;11(11):989-992.
- Porst H, et al. Onset of efficacy of tadalafil once daily in men with erectile dysfunction: a randomized, double-blind, placebo-controlled trial. J Urol. 2011;185(1):249-255.
- Molinoff PB, et al. PT-141: a melanocortin agonist for the treatment of sexual dysfunction. Ann N Y Acad Sci. 2003;994:96-102.
- Diamond LE, et al. Evaluation of the safety, pharmacokinetics and pharmacodynamic effects of subcutaneously administered PT-141, a melanocortin receptor agonist, in healthy male subjects and in patients with an inadequate response to Viagra. Int J Impot Res. 2004;16(1):51-59.
- Diamond LE, et al. Co-administration of low doses of intranasal PT-141, a melanocortin receptor agonist, and sildenafil to men with erectile dysfunction results in an enhanced erectile response. Urology. 2005;65(4):755-759.
- Cormio L, et al. Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction. Urology. 2011;77(1):119-122.
- U.S. Food and Drug Administration. VYLEESI (bremelanotide injection) prescribing information. 2019.
- DailyMed. Tadalafil tablet, film coated — prescribing information.
- DailyMed. Sildenafil citrate tablet — prescribing information.
- U.S. Food and Drug Administration. Warning Letter: MEDVi, LLC dba MEDVi (721455). February 20, 2026.
- National Institute of Diabetes and Digestive and Kidney Diseases. Erectile Dysfunction — Definition & Facts.
Frequently Asked Questions
What is in MedVi Quad?
The current formula combines sildenafil, tadalafil, PT-141 (bremelanotide) and L-citrulline in one sublingual liquid dose. An earlier version used vardenafil and apomorphine in place of PT-141 and L-citrulline, which is why older reviews describe different ingredients.
Is MedVi Quad FDA-approved?
No. Quad is compounded, meaning a licensed pharmacy prepares it to a prescriber’s order. Compounded drugs are not reviewed by the FDA for safety, effectiveness or quality before reaching patients. Two of the four ingredients are individually approved for erectile dysfunction; PT-141 is approved only as an injection for premenopausal women, so its use here is off-label.
How long does Quad take to work?
MedVi states roughly 10 to 15 minutes for most men. That is plausible for a sublingual dose — a randomised trial found sublingual sildenafil acted faster than a swallowed dose — provided you hold the liquid under your tongue rather than swallowing it straight down.
How long does Quad stay in your system?
The tadalafil component is the long one: its labelling supports improved erectile function up to 36 hours after a dose. Sildenafil clears in roughly 4 hours. Because of that overlap, doses should not be repeated within 24 hours.
Is MedVi Quad legit?
Yes, in the sense that matters most: it is a real prescription medication from a licensed pharmacy, prescribed by a U.S.-licensed provider, not a supplement in disguise. The caveats are that the combination is not FDA-approved, one ingredient is off-label by an unapproved route, and the company received an FDA warning letter in February 2026 over unrelated weight-loss marketing.
Can I drink alcohol with Quad?
One or two drinks are unlikely to stop it working, but alcohol widens blood vessels through its own mechanism and adds to the blood-pressure drop the PDE5 ingredients cause. Heavier drinking increases the chance of dizziness and also blunts erectile response on its own.
What are the side effects of Quad ED drops?
Most commonly headache, facial flushing, nasal congestion and indigestion — the standard PDE5 inhibitor pattern. The more serious risk is an excessive drop in blood pressure, particularly if you take other medicines that lower it. Nitrates and riociguat are absolute contraindications.
What if Quad doesn’t work for me?
Tell the prescriber rather than taking a second dose. Options include adjusting the formula, trying a daily low-dose approach instead of an as-needed one, or moving to a different route entirely. Men who do not respond to any oral therapy still have effective options, including vacuum devices and injections.
Is Quad safe if I have diabetes or high blood pressure?
Often yes, if those conditions are well controlled — both are common among men who take ED medication. Poorly controlled cardiovascular disease is the problem, which is why the evaluation reviews your history and current medications. Be complete about what else you take.
Does insurance cover MedVi Quad?
Almost never. Compounded medications sit outside most formularies, so this is a cash purchase. Generic single-ingredient tablets are the route most likely to be covered or available cheaply at retail.
Decide with the full picture
If the sublingual format solves your specific problem, an online evaluation with a licensed provider is the next step.
See MedVi Quad details
