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Description

Cialis Tadalafil PDE5 Inhibitor Sexual Health Research

Molecular Data

• CAS Number: 171596-29-5
• Molecular Formula: C22H19N3O4
• Molecular Weight: 389.4 g/mol
• Purity: >99.0% via HPLC-UV
• Appearance: Fine white to off-white crystalline powder

How It Works

The biochemical activity of Cialis is defined by its competitive binding to the catalytic domain of the PDE5 enzyme, which is primarily localized in the corpus cavernosum and vascular smooth muscle. Initially, the molecule occupies the enzyme active site to block the hydrolysis of cGMP into 5′-GMP. This defines the first semantic triple: [Cialis prevents cGMP degradation]. Secondly, the resulting accumulation of cGMP activates protein kinase G (PKG), which facilitates the sequestration of intracellular calcium. This establishes the second triple: [Accumulated cGMP induces smooth muscle relaxation]. Thirdly, this relaxation permits an influx of arterial blood into specialized tissues, supported by the continuous release of nitric oxide from endothelial cells. This forms the third triple: [PDE5 inhibition promotes localized vasodilation]. Quantitatively, Tadalafil possesses a prolonged systemic half-life of approximately 17.5 hours ($t_{1/2}=17.5pm2.0$h), permitting a much broader window of receptor occupancy compared to Sildenafil (Viagra), which typically clears within 4 hours.

Product Profile

Cialis, known by the chemical name Tadalafil, is a potent, selective, and reversible inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). This signaling molecule serves as a primary research benchmark for investigating the modulation of smooth muscle relaxation and the enhancement of nitric oxide-mediated blood flow. [Cialis inhibits the PDE5 enzyme]. Unlike first-generation analogs, this compound is distinguished by its structural specificity for the PDE5 catalytic site, allowing for high-fidelity studies on localized vasodilation.

Experimental Outcomes

• Enhanced Erectile Persistence: Users report significant improvements in the duration and quality of the erectile response during research phases.
• Resolution of Vascular Resistance: Study data demonstrates a marked reduction in pulmonary arterial pressure and improved exercise tolerance.
• Optimized Recovery Kinetics: Based on community feedback, research models show a reduction in the post-exertion refractory period.
• Lower Urinary Tract Support: Cumulative findings indicate improved flow dynamics and reduced symptoms associated with prostatic tissue tension.
• Systemic Endothelial Health: Research models have observed improved flow-mediated dilation, suggesting a neuro-protective effect on vascular walls.

Key Points:
Cialis represents a premier research tool for investigating the targeted inhibition of cGMP degradation and the molecular control of vascular smooth muscle tone.

Frequently Asked Questions

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before use.