What is Tadalafil?
Tadalafil is a long-acting, highly selective PDE5 inhibitor with a T½ of approximately 17.5 hours — markedly longer than sildenafil (~4h). High PDE5/PDE6 selectivity ratio minimises visual side effects. Research tool for PDE5 pharmacology, BPH research (PDE5 expression in prostate), erectile physiology, and long-duration cGMP studies. Research use only.
Research Applications
Long-Acting PDE5 Inhibition
T½ ~17.5h — sustained cGMP elevation, steady-state receptor occupancy modelling
High PDE5/PDE6 Selectivity
Minimal PDE6 cross-reactivity vs sildenafil — visual safety mechanism research
BPH & Prostate Research
PDE5 expression in prostate smooth muscle — urinary tract and erectile function
Erectile & Vascular Physiology
Long-duration NO-cGMP pathway amplification, corpus cavernosum biology
Comparative PDE5 Inhibitor Studies
Tadalafil vs sildenafil vs vardenafil — potency, selectivity, duration ladder
Quick Specs
| Form |
C22H19N3O4, MW 389.4 |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
171596-29-5 |
| Molecular Weight |
MS molecular weight confirmed — every batch |
| Specification |
≥99% by HPLC — every batch |
| Shelf Life |
24 months (unopened) |
| Storage |
Room temperature sealed | cool, dry storage |
| Manufacture |
In-house synthesis — Qingdao, China |
| Brand |
China |
Frequently Asked Questions
How do I reconstitute this peptide?
QSC raw powder compounds are supplied as bulk crystalline or amorphous powder in a sealed, labelled container at the stated quantity. No reconstitution is required — the powder is ready for weighing and use in research applications.
How should this peptide be stored?
Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct light. Keep in the original sealed container. Properly stored raw powder remains stable for 2–3 years.
What purity is this QSC compound and how is it verified?
All QSC raw powder compounds are tested to ≥99% purity by HPLC on every production batch, with MS-confirmed identity. COA is published on the product page and independently verifiable at verify.janoshik.com.
🧪 Peptide Research Tools: Use QSC's free
peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
🌍 Domestic shipping: 🇺🇸 USA 5–7 days
🌏 International shipping: 7–14 days
⚠️ RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION
QSC products are strictly for in vitro and in vivo laboratory research.
Safety & Handling
🚫
Not for Human Use
These compounds are for research only.
🥽
PPE Required
Always use appropriate protective equipment.
❄️
Storage Compliance
Follow product-specific storage conditions.
Product-Specific Storage
Room temperature sealed | cool, dry storage
