A non-selective blocker of voltage-dependent K+-channels (Kv channels) that has greatest potency at Kv1 and Kv3 family members (IC₅₀s = 290, 590, 195, 13, 29, and 100 µM for subunits 1.1, 1.2, 1.3, 1.4, 3.1, and 3.2, respectively); also blocks Kv2 and Kv4 subunits at millimolar concentrations.

Synonyms: 4-Pyridylamine Chemical Formula: ₄-(NH₂)C₅H₄N Hill Formula: C₅H₆N₂ CAS Number: 504-24-5 UN Number: UN2671