Fluoxetine also functions as a channel blocker of anoctamin 1, a calcium-activated chloride channel.
In addition, it acts as a positive allosteric modulator of the GABAA receptor at high concentrations, and norfluoxetine does the same but more potently, actions which may be clinically-relevant.
A number of other ion channels, including nicotinic acetylcholine receptors and 5-HT3 receptors, are also known to beinhibited at similar concentrations.