Leu-enkephalin vs Ziconotide
Head-to-head comparison of Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) and Ziconotide (ω-Conotoxin MVIIA (ziconotide)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Leu-enkephalin | Ziconotide |
|---|---|---|
| Category | Pain Management | Pain Management |
| Full Name | Tyr-Gly-Gly-Phe-Leu | ω-Conotoxin MVIIA (ziconotide) |
| Molecular Weight | 555.63 Da | 2639.1 Da |
| Half-Life | 1-5 minutes in plasma | approximately 4.5 hours |
| Amino Acids | 5 | 25 |
| Typical Dose | 0.1-5 ug per animal | 0.5-19.2 mcg/day |
| Route | Intrathecal / intracerebroventricular | Intrathecal |
| Purity | ≥98% | ≥98% |
| Studies Count | 1000 | 500 |
| Research Status | Pre-clinical | Approved |
Leu-enkephalin Benefits
- ✓delta-opioid activity
- ✓endogenous analgesic model
- ✓receptor-selective pharmacology
- ✓nociception pathway research
Ziconotide Benefits
- ✓strong non-opioid analgesia
- ✓effective for refractory neuropathic pain
- ✓opioid-sparing option
- ✓intrathecal delivery allows targeted action
Leu-enkephalin Dosing
Intrathecal 0.1-5 ug per animal|Intracerebroventricular 0.1-2 ug per animal|In vitro 1-100 nM
Ziconotide Dosing
start 0.5 mcg/day intrathecal|titrate by 0.5 mcg/day no more than 2 times weekly|max 19.2 mcg/day in labeling
Leu-enkephalin Side Effects
- ⚠sedation
- ⚠constipation-like opioid effects
- ⚠very short plasma stability
Ziconotide Side Effects
- ⚠dizziness
- ⚠confusion
- ⚠ataxia
Research Overview
Leu-enkephalin
Leu-enkephalin is a standard tool in opioid receptor and pain-transmission research because it helps distinguish delta- from mu-preferring signaling. Its research value is high, but its clinical utility is limited by rapid enzymatic breakdown and delivery challenges.
Ziconotide
Clinical studies and post-marketing data support ziconotide as an analgesic for severe chronic pain that does not respond to conventional therapy. Research focuses on balancing analgesic efficacy with neuropsychiatric tolerability and careful dose titration.
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