Really interesting and glad to see people getting results from this drug.
The question now is whether this can shed some light on the underlying pathology of hyperacusis. It seems that Tamsulosin is a selective α1 receptor antagonist. A quick google search suggests that
"α1A-adrenergic receptor subtypes increase inhibition at dendrodendritic synapses".
Apparently, these type of receptors are found throughout our nervous system and in the cochlea as well. What isn't clear is where exactly in the cochlea these synapses are found - are they the same the ones connecting OHCs to the type II afferents?
Here's some more info on these type of synapses for those interested.
@100Hz,
@serendipity1996,
@FGG thoughts?