Do you happen to know of a side effect from speed, when you come down you feel you need to yawn but you can’t yawn, takes many tries before being able to successfully yawn

any idea what that is from? happens on stimulant come down, almost never while redosing, just when comedown



Amphetamines act directly on facial musculature causing jaw contraction. This is a typical serotoninergic-amphetaminic effect and I suppose the difficulty for yawning you refer can be related to this.


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