Bremelanotide works very differently from flibanserin.
Instead of altering serotonin signaling, bremelanotide activates specific receptors in the brain involved in sexual motivation and arousal.
Mechanism of Action
Bremelanotide is a melanocortin receptor agonist, primarily acting on:
These receptors are located in brain areas involved in:
When activated, they enhance neural pathways associated with sexual interest and responsiveness.
A simplified pathway is:
Brain melanocortin activation → increased sexual motivation/arousal signals → increased sexual desire
Unlike sildenafil, this effect is primarily central (brain-mediated) rather than vascular.
How It Differs from Flibanserin
Flibanserin
Bremelanotide
How It Is Used
What It Does Not Do
Bremelanotide:
Expected Benefits
Clinical studies showed that some women with hypoactive sexual desire disorder experienced:
As with flibanserin, the average benefit is modest and varies among individuals.
Common Side Effects
The most common adverse effects are:
Some women experience nausea after the first few doses, which may lessen with continued use.
Blood Pressure Effects
Unlike flibanserin, which can lower blood pressure, bremelanotide may:
Therefore it is generally avoided in people with uncontrolled hypertension or significant cardiovascular disease.
In One Sentence
Bremelanotide works by stimulating melanocortin receptors in the brain—especially MC4 receptors—to enhance neural pathways involved in sexual desire and arousal, producing an “on-demand” increase in sexual interest rather than a direct physical effect on the genitals.