# Tadalafil — Research Liquid

> Reference entry for a long-acting PDE5 inhibitor — 30 mg/mL solution, 30 mL bottle

All products are sold strictly for laboratory research use only. Not for human or veterinary use.

- Web page: https://peptidemedixeu.com/en/products/tadalafil-research/
- Brand: Peptide Medix EU
- Category: [Hormonal & PDE5 Compounds](https://peptidemedixeu.com/en/collections/hormonal-compounds/)
- CAS number: 171596-29-5
- from €46 (EUR)

## Sizes and prices (EUR)

| Size | Price | SKU |
| --- | --- | --- |
| 30 mL · 30 mg/mL | €46 | TADALAFIL-RESEARCH-30-ML-30-MG-ML |

_Catalog prices at build time; the web page and checkout are authoritative._

## Specifications

- **CAS number:** 171596-29-5
- **Molecular formula:** C22H19N3O4
- **Molecular weight:** 389.40 g/mol
- **Form:** Clear solution in an amber bottle with a graduated dispenser
- **Solubility:** Practically insoluble in water; soluble in DMSO and in organic solvents used for analytical work
- **Listing type:** Prescription-only reference item; released only against valid authorisation
- **Listed presentation:** 30 mL at 30 mg/mL
- **Compound class:** Selective phosphodiesterase type 5 (PDE5) inhibitor
- **Chemical description:** Tetracyclic beta-carboline-derived diketopiperazine with a methylenedioxyphenyl substituent
- **Reference brand names:** Cialis (ED and BPH indications); Adcirca (pulmonary arterial hypertension)
- **Mechanism:** Blocks cGMP hydrolysis by PDE5, prolonging nitric-oxide-driven smooth muscle relaxation
- **Approved indications (regulatory fact):** Erectile dysfunction; signs and symptoms of benign prostatic hyperplasia; pulmonary arterial hypertension
- **Pharmacology note:** Long elimination half-life relative to sildenafil and vardenafil; PDE5-selective with modest PDE11 affinity
- **Storage:** Room temperature, upright, tightly closed and protected from light

## Description

Tadalafil blocks phosphodiesterase type 5 (PDE5) selectively; this enzyme normally breaks down cGMP in the smooth muscle of blood vessels. The molecule is not a peptide but a compact heterocycle — a tetracyclic diketopiperazine built on a beta-carboline core, formula C22H19N3O4, molecular weight around 389.4 g/mol. Regulatory records know it mainly as the active substance in Cialis and Adcirca.

Its authorisations, as a matter of public record, cover erectile dysfunction and the urinary symptoms of an enlarged prostate (benign prostatic hyperplasia); pulmonary arterial hypertension is covered separately, under another brand name at another strength. The feature most discussed in the pharmacology literature is its plasma half-life, which is long compared with other PDE5 inhibitors. The 30 mg/mL solution in a 30 mL bottle shown on this page is listed purely for reference and analytical work.

## Frequently asked questions

### Can it be obtained without a prescription?

No. In the EU, as in the US and similar jurisdictions, tadalafil may only be supplied on prescription. This page exists as an entry in an institutional reference catalogue; we release material only when a licensed practitioner or accredited research institution provides valid authorisation.

### For which conditions is tadalafil authorised?

Public regulatory records list erectile dysfunction and the urinary symptoms of benign prostatic hyperplasia; a different brand at a different strength is authorised for pulmonary arterial hypertension. We state this as fact, not as a recommendation of any use.

### Do you provide a certificate of analysis?

Yes. Identity and purity are recorded on a certificate specific to each lot; give us the lot number and we will send it. For reference and analytical purposes, that lot-level paperwork is exactly what this listing offers.

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All products offered on this website are intended solely for in-vitro laboratory research and development by qualified professionals. They are not drugs, foods, cosmetics or dietary supplements, and are not intended to diagnose, treat, cure or prevent any disease. Products must not be introduced into humans or animals in any manner. By purchasing, you confirm that you are a qualified researcher and accept full responsibility for handling and storage in accordance with applicable laws.

Peptide Medix EU · https://peptidemedixeu.com/en/products/tadalafil-research/