Why does a drug that blocks reuptake transporters in a synapse often prolong the effect of a neurotransmitter, rather than simply increasing its concentration?

💡 Explanation

A reuptake transporter clears neurotransmitters from the synapse, therefore, blocking it increases the time a neurotransmitter spends interacting with receptors. This prolongs its effect because increased dwell time maintains receptor activation, rather than only transiently elevating the concentration, which could be cleared quickly by other mechanisms.

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