This is a list of investigational headache and migraine drugs, or drugs that are currently under development for clinical use in the treatment of headaches and/or migraines but are not yet approved. They may also be referred to as investigational antimigraine agents.
Chemical/generic names are listed first, with developmental code names, synonyms, and brand names in parentheses. The format of list items is "Name (Synonyms) – Mechanism of Action – Indication [Reference]".
This list was last comprehensively updated in September 2025. It is likely to become outdated with time.
The AGX-201 is chemically 2-(4-imidazolyl)ethylamine dihydrochloride, refer to Fig. 12.7 for the chemical structure. [...] AGX-201 is a dihydrochloride salt of histamine. [...]
AGX-201 is a histamine receptor modulator that acts as an antagonist at H1 receptors and an agonist at H3 receptors. This dual mechanism of action offer a unique approach to mitigate migraine symptoms by reducing the release of proinflammatory neuropeptides from trigeminal nerve endings. Subcutaneous AGX-201 is currently tested in a phase II trial (NCT02021474) enrolling subjects with migraine requiring prophylactic treatment.
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