Pharmacodynamic Receptor Explorer & Clinical Sensation Matrix

Receptor Impact & "Stomach Lock" Comparator

Most people don't know how Retatrutide, Tirzepatide, and Semaglutide differ biologically. Compare GLP-1, GIP, and Glucagon receptor affinities, evaluate gastric emptying delay, and see which drug halts hunger versus which one locks the stomach.

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Need Pharmacokinetic Serum Curves & Half-Life Graphs? Simulate continuous multi-dose Bateman decay, half-life superposition, and steady-state accumulation.

Open GLP-1 PK Plotter →

⚡ Quick Research Faceoffs 1-click popular dose comparisons:

Compound A

Dual Agonist

Select Medication

Research Dosage 10.0 mg

Compound B

Triple Agonist

Select Medication

Research Dosage 8.0 mg

⚠️ Core Biological Distinction Explained

The "Stomach Lock" vs. Hunger Muting Divergence

Why does Retatrutide make your stomach feel like a brick before your cravings disappear? Below is the real-time ratio comparing Mechanical Gastric Retention (stomach emptying delay) against Central Brain Satiety.

Tirzepatide (10mg) Balanced Profile

Stomach Delay vs Hunger Ratio: 0.82 (Harmonious)

🧠 Hunger Shutoff: 90%

⏳ Stomach Delay ("Lock"): 65%

Tirzepatide provides smooth satiety. Central food cravings are silenced in step with a moderate, manageable delay in gastric emptying.

Retatrutide (8mg) Stomach Lock Dominates

Stomach Delay vs Hunger Ratio: 1.25 (Intense Lock)

🧠 Hunger Shutoff: 82%

⏳ Stomach Delay ("Lock"): 94%

Glucagon + GLP-1 synergy clamps gastric motility. Food lingers in the stomach for many hours, creating profound physical fullness even if your brain's appetite has not yet fully shut off.

Triple-Receptor Agonism Map

Relative Potency

Visualizes relative binding affinity across the three primary metabolic receptors: GLP-1R, GIPR, and GCGR (Glucagon).

Compound A

Compound B

Head-to-Head Physiological Impact Scores

Calibrated against clinical trial findings (SURPASS, STEP, and TRIUMPH-1).

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Hunger & "Food Noise" Suppression Central nervous system satiety via POMC/NPY hypothalamic neurons.

Tirzepatide (10mg) 92%

Retatrutide (8mg) 88%

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Stomach Lock & Gastric Emptying Delay Antroduodenal motility pause; physical gastric retention time.

User Focus

Tirzepatide (10mg) 65%

Retatrutide (8mg) 95% (Extreme)

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Thermogenesis & Calorie Burn (BMR Boost) Glucagon-driven hepatic fatty acid oxidation & brown fat energy expenditure.

Tirzepatide (10mg) 30%

Retatrutide (8mg) 92%

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Insulin Sensitivity & Lipid Buffering GIP-mediated glucose clearance and healthy adipose fatty acid storage.

Tirzepatide (10mg) 96%

Retatrutide (8mg) 90%

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GI Sensitivity & Nausea Risk Index Gastrointestinal discomfort risk caused by rapid food retention or GLP-1 spikes.

Tirzepatide (10mg) 40% (Low-Mod)

Retatrutide (8mg) 75% (Elevated)

Practical Clinical Insights

Everyday Practical Breakdown: How These Sensations Feel

Translating complex molecular biology into what real human research participants experience day-to-day.

Semaglutide (Pure GLP-1)

The "Brain Silence" Drug: Semaglutide works primarily through your brain's satiety receptors. Constant thoughts of food, snacking urges, and obsessive sugar cravings disappear.

Why nausea occurs: Because there is no GIP buffer, rapid dose jumps directly overstimulate the brain's emetic trigger zone.

Tirzepatide (GIP + GLP-1)

The "Balanced Satiety" Drug: Tirzepatide shuts down appetite effectively while feeling markedly gentler on the stomach than high-dose Semaglutide.

The GIP Shield: GIP acts as a biological shock absorber in the stomach and brain, lowering nausea while dramatically improving insulin sensitivity.

Retatrutide (Triple GGG)

The "Stomach Lock & Furnace" Drug: Glucagon ramps up resting calorie burn and raises body heat. But Glucagon also slows stomach motility far beyond GLP-1 alone.

The Critical Retatrutide Rule: Meals must be cut to 1/3 normal size. Eating a normal meal with a "locked stomach" causes severe fullness, burping, and reflux.

Peer-Reviewed Literature

Receptor Affinity & Pharmacodynamic Benchmark Table

In-Vitro EC50 Potency relative to Native Peptides

Medication	Receptors	GLP-1R Potency	GIPR Potency	Glucagon (GCGR)	Stomach Delay	Calorie Burn
Semaglutide	Mono (GLP-1)	1.00× (Full)	0.00× (None)	0.00× (None)	Moderate	Baseline
Tirzepatide	Dual (GIP/GLP-1)	0.20× (Biased)	1.00× (Full)	0.00× (None)	Smooth / Mod	+5% to +10%
Retatrutide	Triple (GIP/GLP/Gluc)	0.35× (Active)	3.10× (Super)	0.45× (High)	Very High ("Lock")	+15% to +22%
CagriSema	GLP-1 + Amylin	1.00×	0.00×	Amylin 1.00×	High	+6% to +8%
Survodutide	Dual (GLP/Gluc)	0.50×	0.00×	0.50× (High)	High	+12% to +18%