Gustatory suppression + Memantine
Memantine is known to produce gustatory suppression, a multisensory effect. Gustatory suppression is the diminishment or elimination of taste perception, rendering food and drink bland, flavorless, or entirely tasteless — an effect that typically co-occurs with broader sensory dampening.
About Gustatory suppression
Gustatory suppression is the progressive dulling of taste perception, ranging from a subtle flattening of flavor complexity at lower levels to a near-total inability to taste anything at higher intensities. Food becomes bland and textureless — not actively unpleasant, but stripped of the qualities that normally make eating rewarding. A meal that should taste rich and complex registers as cardboard. Sweetness, saltiness, acidity, bitterness, and umami all fade into a uniform, flavorless nothing.
The experience is more disorienting than it might sound on paper. Taste is so deeply integrated into our relationship with food and drink that its absence creates an unsettling disconnect — the mechanics of eating (chewing, swallowing, feeling full) continue normally, but the sensory reward that normally accompanies them is simply gone. Many people describe finding food actively unappealing during gustatory suppression, not because it tastes bad but because it tastes like nothing at all. The act of eating without tasting feels pointless and strange, which can lead to reduced food intake during the experience.
Gustatory suppression is typically part of a broader pattern of sensory dampening rather than an isolated phenomenon. It most commonly co-occurs with tactile suppression, olfactory suppression, and pain relief — a constellation of effects that reflects generalized reduction in sensory processing. Since the gustatory system is intimately linked with the olfactory system (much of what we experience as "taste" is actually retronasal smell), olfactory suppression alone can dramatically reduce the perceived richness of flavors even if the taste buds themselves are functioning normally.
The primary substance class associated with gustatory suppression is dissociatives — ketamine, PCP, DXM, and their analogs. The NMDA receptor antagonism that defines this class produces broad-spectrum sensory suppression, and taste is among the senses affected.Opioids andantipsychotics can also produce gustatory suppression as part of their general dampening of sensory and hedonic processing. The effect is dose-dependent and fully reversible, resolving as the substance is metabolized.