Tavist (clemastine fumarate) is an antihistamine being studied for its ability to stimulate remyelination in conditions like Multiple Sclerosis (MS). It does this through a specific mechanism:
How It Works
- Targeting Receptors: Clemastine blocks M1 muscarinic receptors on oligodendrocyte precursor cells (OPCs).
- Cell Maturation: By inhibiting these receptors, it triggers OPCs to differentiate and mature into functional oligodendrocytes.
- Myelin Production: These mature cells can wrap around damaged axons. They create new myelin sheaths, which insulate nerves and restore signal speed.
Clinical Evidence
In the ReBUILD clinical trial, patients with MS who took clemastine showed improved “visual evoked potentials.” This indicated that nerve signals in the optic nerve were traveling faster because their myelin was repaired.
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While it is available over-the-counter for allergies, clemastine is not currently FDA-approved for remyelination or treating MS. Using it for this purpose involves higher doses that can cause significant drowsiness and fatigue.