Tadalafil: Complete Product & Scientific Information

Introduction

Tadalafil is a selective phosphodiesterase type 5 (PDE5) inhibitor widely used in modern medicine. It is primarily prescribed for the treatment of erectile dysfunction (ED), benign prostatic hyperplasia (BPH), and pulmonary arterial hypertension (PAH) under specific formulations.

One of tadalafil’s distinguishing characteristics is its long duration of action, which can extend up to approximately 36 hours. This pharmacokinetic profile has earned it the nickname “the weekend pill.”

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What is Tadalafil?

Tadalafil belongs to the phosphodiesterase type 5 inhibitor drug class. It enhances blood flow by relaxing smooth muscle tissue through increased cyclic guanosine monophosphate (cGMP) concentrations following nitric oxide release.

Unlike other PDE5 inhibitors, tadalafil possesses a relatively long elimination half-life of approximately 17.5 hours.

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Mechanism of Action

Tadalafil selectively inhibits PDE5, the enzyme responsible for degradation of cyclic GMP.

The sequence includes:

• Sexual stimulation releases nitric oxide.
• Nitric oxide activates guanylate cyclase.
• cGMP production increases.
• Smooth muscle relaxes.
• Blood vessels dilate.
• Blood flow improves.

This mechanism assists erectile function when sexual stimulation is present.

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Approved Medical Uses

Healthcare providers may prescribe tadalafil for:

• Erectile dysfunction (ED)
• Benign prostatic hyperplasia (BPH)
• Erectile dysfunction with BPH
• Pulmonary arterial hypertension (specific formulations)

Treatment decisions should always be individualized by qualified healthcare professionals.

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Benefits

Potential therapeutic advantages include:

• Long duration of action
• Once-daily dosing option
• Flexible treatment schedule
• High selectivity for PDE5
• Well-established clinical evidence
• Generally predictable pharmacokinetic profile

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Pharmacokinetics

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Technical Details

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Chemical Structure

Chemical Name

(6R,12aR)-2,3,6,7,12,12a-Hexahydro-2-methyl-6-(3,4-methylenedioxyphenyl)-pyrazino[1′,2′:1,6]pyrido[3,4-b]indole-1,4-dione

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CAS Number

CAS: 171596-29-5

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Chemical Formula

C22H19N3O4

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Product Information

Tadalafil is manufactured under strict pharmaceutical quality standards. Commercial products are available in multiple strengths depending on the approved indication and regional regulatory requirements.

Healthcare professionals should prescribe tadalafil according to approved labeling and patient-specific clinical considerations.

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Packaging Information

Packaging varies by manufacturer and market but commonly includes:

• Blister packs
• Bottles with child-resistant closures
• Unit-dose packaging
• Hospital packaging

Available strengths differ depending on approved pharmaceutical products.

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Purity, Testing & Quality Assurance

Pharmaceutical manufacturers generally perform quality testing including:

• Identity confirmation
• HPLC assay
• Related substances
• Dissolution testing
• Microbial testing (where applicable)
• Stability studies
• Moisture determination
• Uniformity testing

Testing methods follow applicable pharmacopeial standards where appropriate.

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Request the Current COA

For pharmaceutical ingredients or finished products, a current Certificate of Analysis (COA) may be obtained directly from the manufacturer or authorized supplier upon request, subject to applicable quality and regulatory procedures.

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Common Research Applications

In scientific research, tadalafil has been investigated in areas including:

• PDE5 inhibition
• Vascular biology
• Smooth muscle physiology
• Nitric oxide signaling
• Endothelial function
• Cardiovascular pharmacology
• Pulmonary vascular research
• Pharmacokinetic studies

Research use should comply with institutional, ethical, and regulatory requirements.

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Storage Recommendations

Store according to manufacturer instructions:

• Protect from moisture
• Keep away from direct sunlight
• Store at recommended room temperature
• Keep in original packaging
• Keep out of reach of children

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Precautions

Individuals should consult a qualified healthcare professional before taking tadalafil.

Important precautions include:

• Concurrent nitrate therapy may cause dangerous hypotension.
• Use caution with alpha-blockers and certain antihypertensive medications.
• Inform healthcare providers of cardiovascular disease, liver disease, or kidney disease.
• Seek immediate medical attention for chest pain, sudden vision loss, hearing loss, or an erection lasting more than four hours.

Do not exceed prescribed dosing.

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Possible Side Effects

Common adverse effects may include:

• Headache
• Flushing
• Nasal congestion
• Indigestion
• Muscle aches
• Back pain

Less common but serious adverse events require prompt medical evaluation.

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Drug Interactions

Potential interactions include:

• Organic nitrates
• Guanylate cyclase stimulators
• Strong CYP3A4 inhibitors
• Strong CYP3A4 inducers
• Alpha-blockers
• Antihypertensive medications

Always review current medications with a healthcare professional.

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Shipping & Availability

Availability varies according to local regulations and approved pharmaceutical markets. Tadalafil is a prescription medicine in many countries, and dispensing is subject to applicable laws and healthcare requirements. Storage and transportation should follow manufacturer recommendations to maintain product quality.

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Frequently Asked Questions

How long does tadalafil last?

Its therapeutic effects may last up to approximately 36 hours, although individual responses vary.

Is tadalafil taken daily?

Some patients are prescribed daily therapy, while others receive it for use as needed. The appropriate regimen depends on the medical indication and a clinician’s assessment.

Can tadalafil be taken with food?

Tadalafil can generally be taken with or without food, though patients should follow the prescribing information and their healthcare provider’s guidance.

Is tadalafil suitable for everyone?

No. Certain medical conditions and medications may make tadalafil inappropriate or unsafe for some individuals.

For authoritative medical information, consider referencing:

• World Health Organization (WHO)
• U.S. Food and Drug Administration (FDA)
• European Medicines Agency (EMA)
• National Institutes of Health (NIH)
• MedlinePlus
• DailyMed
• PubChem
• National Center for Biotechnology Information (NCBI)

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Conclusion

Tadalafil is a well-established phosphodiesterase type 5 inhibitor used for several approved medical conditions, including erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. Its extended duration of action and extensive clinical evidence have made it an important therapeutic option when prescribed appropriately. Patients should use tadalafil only under the guidance of a qualified healthcare professional and according to applicable prescribing information.

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Disclaimer

This article is provided for educational and informational purposes only and is not intended as medical advice, diagnosis, or treatment. Tadalafil is a prescription medication in many jurisdictions. Always consult a qualified healthcare professional before starting, stopping, or changing any medication. Use only products obtained through licensed pharmacies or other authorized sources and in accordance with local laws and regulations.