On this page Jump to a section
- Key facts
- What is liquid tadalafil?
- Forms of tadalafil in the US
- Why dropper dosing is risky
- Research chemical tadalafil
- Compounded tadalafil drops
- What each path includes
- Safety checks before ED medication
- If you want a format other than a swallowed pill
- Mendoxa plans and prices
- FAQ
- How we wrote this
- Sources and references
Key facts at a glance
- ED forms
- FDA-approved tadalafil for ED comes as tablets (brand and generic)Cialis (tadalafil) label · DailyMed
- Approved liquid
- Tadliq: 20 mg/5 mL oral suspension for PAH, not EDTadliq (tadalafil) label · DailyMed
- Compounded status
- Compounded liquids and the Mendoxa compounded tablet are not FDA-approvedFDA compounding Q&A
- Buying online
- Look for a prescription requirement and a state-licensed pharmacyFDA BeSafeRx pharmacy checklist
What is liquid tadalafil?
Check the product name before comparing liquids. “Liquid Cialis” is not the name of an approved Cialis formulation: the Cialis (tadalafil) label describes tablets, while the Tadliq (tadalafil) label describes a suspension for PAH.
A compounded liquid is a separate category: compounded drugs are not FDA-approved, and FDA explains that a liquid may be needed when a patient cannot swallow an approved tablet (FDA compounding Q&A). “Research use only” is not a substitute for a prescription or an approved medicine; use the FDA BeSafeRx checklist before ordering.
Start with our tadalafil guide for the tablet overview, or use the forms table below to identify what you have found.
Forms of tadalafil in the US: FDA status and indication
FDA approval applies to a specific product and use. The Cialis (tadalafil) label covers ED; the Tadliq (tadalafil) label covers PAH. A shared ingredient does not make the products interchangeable.
| Form | FDA status | Approved use | Strength as labeled | Source |
|---|---|---|---|---|
| Cialis tablets (brand, Lilly) | FDA-approved brand tablets | ED; signs and symptoms of BPH; ED with BPH | 5, 10 and 20 mg tablets; the 2.5 mg strength is listed as discontinued | Cialis (tadalafil) label; Drugs@FDA Cialis (tadalafil) listing |
| Generic tadalafil tablets | FDA-approved generic tablets (ANDA) | ED; signs and symptoms of BPH; ED with BPH | 2.5, 5, 10 and 20 mg tablets | generic tadalafil tablet label |
| Tadliq oral suspension (CMP Pharma) | FDA-approved oral suspension | Pulmonary arterial hypertension (PAH) only; not ED | 20 mg/5 mL | Tadliq (tadalafil) label; Drugs@FDA Tadliq (tadalafil) listing |
| Compounded tadalafil liquid or drops | not FDA-approved; Prescription required | No FDA-approved indication | Set by the prescription and the compounding pharmacy | FDA compounding Q&A |
| “Research chemical” tadalafil liquid | Research labeling is not FDA approval | No approved human indication established by research labeling | Do not use a seller’s concentration as prescribing instructions | FDA BeSafeRx: prescription and pharmacy checks |
Sources: Cialis (tadalafil) label; generic tadalafil tablet label; Tadliq (tadalafil) label; Drugs@FDA Cialis (tadalafil) listing; FDA compounding Q&A; FDA BeSafeRx. Accessed Oct 24, 2026.
Compare generic Cialis or read about daily tadalafil before discussing a tablet prescription.
Why dosing a dropper of unregulated liquid is risky
A volume marking does not tell you the tadalafil dose without a reliable concentration. The Tadliq (tadalafil) label identifies a concentration of 20 mg/5 mL and directs patients to shake the bottle for 30 seconds before measuring.
Do not copy the PAH instructions for ED. Tadliq’s labeled PAH dose is 40 mg (10 mL) once daily (Tadliq (tadalafil) label); the Cialis as-needed ED instructions allow up to 20 mg and no more than once daily in most patients (Cialis (tadalafil) label). These are product-specific instructions, not a conversion guide for online drops.
Do not add a liquid to an existing ED prescription. The Tadliq (tadalafil) label says to avoid Cialis and other PDE5 inhibitors, and the Cialis (tadalafil) label advises against combining PDE5 inhibitors or other ED therapies.
If you have a prescribed compounded liquid, ask the pharmacist to confirm the concentration, measuring device and written directions; FDA notes that compounded drugs are not FDA-approved. A bottle marked “not for human consumption” should not be used to treat ED; check the seller against FDA BeSafeRx.
Tadalafil research chemicals: what the label does not prove
“Research use only” is not evidence of FDA approval, a valid prescription or a licensed pharmacy. FDA BeSafeRx says a likely safe online pharmacy requires a doctor’s prescription, has a US address and telephone number, employs a licensed pharmacist and holds a state pharmacy license.
Do not treat a seller’s dropper chart as equivalent to the Cialis (tadalafil) label. If your goal is ED care, take the product name and your questions to a licensed prescriber rather than choosing a research-labeled liquid yourself.
For another category that needs careful label checks, see our Rhino pills guide.
Compounded tadalafil liquid drops and “liquid Cialis”
Ask a prescriber about the reason you need a liquid. FDA gives difficulty swallowing an approved tablet as an example of when compounding may address a medical need; compounded products are not FDA-approved (FDA compounding Q&A). Prescription required.
The Cialis (tadalafil) label provides ED tablet instructions, not a dose for compounded drops. Ask the dispensing pharmacist for product-specific instructions rather than converting tablet directions yourself.
If swallowing is your concern, discuss formats during the visit. Our sublingual ED tablet guide explains the dissolving-tablet option; Mendoxa’s option is a tablet, not a tadalafil liquid.
What each path includes
Pick the path that matches your situation, then confirm it with a prescriber. This is a guide for that conversation, not a way to treat yourself.
| Your situation | Path | What it includes | Boundary |
|---|---|---|---|
| I want FDA-approved tadalafil for ED | Prescription for Cialis or generic tadalafil tablets | Tablets with an FDA-reviewed ED dose range (Cialis (tadalafil) label; generic tadalafil tablet label) | Prescription required; not with nitrates |
| I have pulmonary arterial hypertension | Tadliq, prescribed for PAH | A measured 20 mg/5 mL suspension with a PAH dose (Tadliq (tadalafil) label) | Not an ED product; avoid with Cialis or other PDE5 inhibitors |
| I have trouble swallowing tablets | Tell the prescriber before choosing a form | A discussion of a compounded liquid or a dissolving tablet | Compounded products are not FDA-approved |
| I saw “research” tadalafil drops online | Do not use them to treat yourself | Check any seller against FDA BeSafeRx: a likely safe pharmacy always requires a prescription | No FDA-reviewed label, dose or quality check |
| I want to know whether Mendoxa fits | Mendoxa online assessment | Independent licensed providers review your history for the compounded rapid-dissolve tablet | Prescription required; the tablet is not FDA-approved |
Sources: Cialis (tadalafil) label; generic tadalafil tablet label; Tadliq (tadalafil) label; FDA compounding Q&A; FDA BeSafeRx; Mendoxa care information. Accessed Oct 24, 2026.
For your online visit, have your current medicine list, the names of products you have tried and your reason for wanting a different format ready. Browse ED medication options to prepare your questions.
Could Mendoxa ED care fit you?
Online ED visit · Prescription required · Independent licensed providers · Not available in California
Safety checks before ED medication
- Tadalafil and sildenafil are contraindicated with organic nitrates or riociguat (Viagra (sildenafil) label; Cialis (tadalafil) label).
- An erection lasting more than 4 hours needs immediate medical care (Viagra (sildenafil) label; Cialis (tadalafil) label).
- Stop and seek care for sudden vision loss or sudden decrease or loss of hearing (Viagra (sildenafil) label; Cialis (tadalafil) label).
- Common adverse effects include headache and flushing with sildenafil, and headache, indigestion and back pain with tadalafil (Viagra (sildenafil) label; Cialis (tadalafil) label).
- The Tadliq (tadalafil) label says to avoid use with Cialis or other PDE5 inhibitors and to avoid Tadliq with severe kidney or liver impairment.
- The APOKYN (apomorphine) label contraindicates use with 5HT3 antagonists such as ondansetron and warns about nausea and fainting.
Do not add another ED medicine to an existing treatment on your own: the Viagra (sildenafil) label and Cialis (tadalafil) label say combinations with other PDE5 inhibitors or ED therapies have not been studied and advise against such use. See ED medication and nitrates for more detail.
If you want a format other than a swallowed pill
Make the next step a visit, not a bottle choice. Tell the provider why you searched for liquid tadalafil and ask whether the Mendoxa 3-in-1 rapid-dissolve tablet fits your needs. Independent licensed providers assess suitability. Prescription required.
The tablet combines sildenafil, tadalafil and apomorphine; it is not FDA-approved. Ingredient references are the Viagra (sildenafil) label, Cialis (tadalafil) label and APOKYN (apomorphine) label; APOKYN is an injectable Parkinson’s treatment, and its label is not approval of this ED combination.
Read about the combination ED tablet, then start your online visit using the button below. The single Mendoxa pricing table lists the available quantities and totals.
Mendoxa ED plans and prices
The Mendoxa ED tablet is a compounded rapid-dissolve tablet with sildenafil (the active ingredient in Viagra), tadalafil (the active ingredient in Cialis) and apomorphine (APOKYN label). It dissolves under the tongue. A licensed clinician decides if it fits you and selects the strength. Compounded medicines are not FDA-approved.
| Tablets per month | 1-month total | Per tablet (1 month) | 3-month total | Per tablet (3 months) |
|---|---|---|---|---|
| 6 tablets / month | $129 | $21.50 | $329 | $18.28 |
| 10 tablets / month | $149 | $14.90 | $379 | $12.63 |
| 20 tablets / month | $179 | $8.95 | $449 | $7.48 |
The 3-month total covers three months at the monthly tablet quantity shown.
If prescribed · Cancel anytime · Available in 49 states (not California). Prices from the Mendoxa intake at try.mendoxa.co/f/ed on Oct 24, 2026. The intake always shows the current price.
The standard tablet form: generic Cialis (tadalafil). Another non-chewable option: sublingual ED tablets.
Duration of a dose: how long Cialis lasts. Dissolve-under-the-tongue options: apomorphine.
Related reading: Cialis and grapefruit, tadalafil 2.5 mg.
FAQ
Is liquid tadalafil FDA-approved?
Yes: Tadliq is a liquid tadalafil product approved for PAH, not ED (Tadliq (tadalafil) label). Compounded tadalafil liquids are not FDA-approved; an online “research” label does not establish approval.
Is there a liquid Cialis?
The Cialis (tadalafil) label describes tablets, not a liquid Cialis formulation. Tadliq contains tadalafil but has a separate PAH indication (Tadliq (tadalafil) label).
Can Tadliq be used for erectile dysfunction?
Tadliq has no FDA-approved ED indication; its label covers PAH (Tadliq (tadalafil) label). Ask a prescriber about ED treatment rather than borrowing its PAH directions; FDA-approved tadalafil ED instructions are for tablets (Cialis (tadalafil) label).
Is research chemical tadalafil safe to take?
A “research use only” label does not establish safety or FDA approval. Do not use it as an ED prescription: FDA BeSafeRx recommends checking for a prescription requirement, a state pharmacy license and access to a pharmacist; the Cialis (tadalafil) label is not dosing guidance for an unverified liquid.
How much liquid tadalafil should I take for ED?
There is no FDA-approved ED dosing instruction for liquid tadalafil in the Tadliq (tadalafil) label; that product is labeled for PAH. For a prescribed compounded liquid, ask the pharmacist for its specific measuring instructions; the Cialis (tadalafil) label gives tablet instructions, not a dropper conversion.
Is there a dissolving tablet instead of liquid tadalafil?
Mendoxa offers a compounded rapid-dissolve tablet with sildenafil, tadalafil and apomorphine. It is not FDA-approved; Independent licensed providers decide if it suits you. Prescription required. See the Viagra (sildenafil) label, Cialis (tadalafil) label and APOKYN (apomorphine) label for each ingredient.
Ready to see if the Mendoxa ED tablet fits you?
From $129/month if prescribed · Cancel anytime · Available in 49 states (not California)
How we wrote this
Written by the Mendoxa editorial team · Sources: DailyMed/FDA. Medical facts on this page come from the FDA-approved labels on DailyMed and Drugs@FDA; each drug name links to its label. We checked the linked DailyMed labels and FDA guidance on Oct 24, 2026. The tables distinguish product approval from approval for a particular use; an ingredient label does not establish the safety or effectiveness of a compounded combination. Mendoxa product details and prices follow the supplied intake brief. No research-chemical sellers are linked, and no competitor efficacy claims are used.
Updated Oct 24, 2026. This page is general information, not medical advice. A licensed clinician decides what fits you.
References
- DailyMed: VIAGRA (sildenafil citrate) tablet, film coated, label revised 12/2017. Accessed Oct 24, 2026.
- DailyMed: CIALIS (tadalafil) tablet, film coated, label revised 3/2026. Accessed Oct 24, 2026.
- DailyMed: APOKYN (apomorphine hydrochloride) injection, label revised 6/2022. Accessed Oct 24, 2026.
- FDA (Drugs@FDA): VIAGRA (sildenafil) prescribing information, NDA 020895. Accessed Oct 24, 2026.
- FDA (Drugs@FDA): CIALIS (tadalafil) prescribing information, NDA 021368. Accessed Oct 24, 2026.
- FDA: Compounding and the FDA, questions and answers. Accessed Oct 24, 2026.
- DailyMed: Tadliq (tadalafil) oral suspension. Accessed Oct 24, 2026.
- FDA: Tadliq (tadalafil) labeling. Accessed Oct 24, 2026.
- Drugs@FDA: Cialis (tadalafil) listing. Accessed Oct 24, 2026.
- DailyMed: generic tadalafil tablets. Accessed Oct 24, 2026.
- FDA BeSafeRx: considering an online pharmacy. Accessed Oct 24, 2026.
- Mendoxa ED care (product, format, max 1 dose per 24 hours). Accessed Oct 24, 2026.
- Mendoxa ED intake: plan prices (term_options). Accessed Oct 24, 2026.
About Mendoxa
Mendoxa (mendoxa.co) is a US telehealth brand. Independent licensed providers (licensed clinicians in the LocumTele network) review each online visit, and prescriptions are filled by Rush Pharmacy, a licensed US pharmacy. Available in 49 states (not California).
- Prescription required. A licensed clinician reviews every visit and can say no. A prescription is not automatic.
- A compounded medicine is not an FDA-approved finished product (FDA compounding Q&A).
- Plans: 1 month or 3 months, from $129. If prescribed · Cancel anytime · Available in 49 states (not California).
Compounded medication prescribed only if a licensed U.S. clinician decides it is appropriate. Not FDA-approved as a finished product. Not available in California. This site is not for emergencies. Call 911 if you need urgent care.