Memantine Effects

A distinct decrease in hunger and desire to eat, ranging from reduced interest in food to complete disinterest or even physical revulsion at the thought of eating. This effect can persist for many hours beyond the primary experience.

Bodily control enhancement is the subjective feeling of improved physical precision, coordination, and dexterity — a sense of heightened mastery over one's own body that can make movements feel fluid, deliberate, and effortless.

A distortion of one's proprioceptive sense of gravity in which the perceived direction of gravitational pull shifts, tilts, or disappears entirely. One may feel as though floating upward, sinking downward, falling sideways, or drifting through weightless space.

A slowing or cessation of bowel movements resulting in difficulty passing stool, commonly caused by opioid receptor activation in the gastrointestinal tract and notoriously resistant to tolerance development.

A decreased desire and need to cough, medically known as antitussive action, which can also allow inhalation of larger amounts of smoke without triggering the cough reflex.

Decreased libido is a diminished interest in and desire for sexual activity, commonly caused by substances that suppress dopaminergic reward signaling, dampen emotional responsiveness, or induce sedation.

Difficulty urinating, also known as urinary retention, is the experience of being unable to easily pass urine despite a full bladder, commonly caused by stimulant, opioid, and anticholinergic substances that affect bladder muscle control.

A sensation of spinning, swaying, or lightheadedness that impairs balance and spatial orientation, often accompanied by nausea and difficulty standing or walking steadily.

A painful sensation of pressure, throbbing, or aching in the head that can range from a dull background discomfort to a debilitating pounding that dominates awareness. Substance-induced headaches may occur during the acute effects, during the comedown, or as a rebound symptom hours to days after use.

A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a forceful, rapid pounding felt throughout the chest, neck, and temples. This effect is among the most commonly reported physiological responses to psychoactive substances and often accompanies stimulation, anxiety, or physical exertion during intoxication.

A distinct decrease in the ability to control one's physical body with precision, balance, and coordination, ranging from minor clumsiness to complete inability to walk.

An uncomfortable sensation of queasiness and stomach discomfort that may or may not lead to vomiting, often occurring during the onset phase of many substances.

Nausea suppression is the pharmacological reduction or elimination of nausea and the urge to vomit, achieved through substances that act on serotonin, dopamine, histamine, or cannabinoid receptors involved in the emetic reflex.

Orgasm suppression (anorgasmia) is the difficulty or complete inability to achieve orgasm despite adequate sexual stimulation, commonly caused by opioids, dissociatives, SSRIs, and stimulants through mechanisms including tactile suppression, serotonergic excess, and altered CNS signaling.

A suppression of negative physical sensations such as aches and pains, ranging from dulled awareness of discomfort to complete inability to perceive pain.

Perception of bodily lightness is the subjective feeling that one's body has become dramatically lighter — sometimes nearly weightless — producing sensations of buoyancy, effortless movement, and a bouncy, energized physical state.

Physical autonomy is the experience of one's body performing actions — from simple tasks like walking to complex sequences like cleaning — in an automatic, self-directed manner that requires little to no conscious input or decision-making.

A perceptual distancing from one's own physical body that ranges from a subtle sense of numbness or detachment to a profound feeling of complete separation from the physical form. At its most intense, the body may feel like an external object, a vessel being observed from outside, or may seem to disappear from awareness entirely.

An intensely pleasurable bodily sensation that can manifest as waves of warmth, tingling electricity, or a full-body orgasmic glow radiating outward from the core. This effect is often described as one of the most rewarding physical sensations available through psychoactive substances and is a primary driver of the recreational appeal of many substance classes.

A dangerous slowing and shallowing of breathing that can progress from barely noticeable reductions in respiratory rate to life-threatening cessation of breathing. This is the primary mechanism of death in opioid overdoses and represents one of the most critical safety concerns across all of psychopharmacology.

Stamina enhancement is an increase in one's ability to sustain physical and mental exertion over extended periods without succumbing to fatigue, achieved through substances that modulate energy metabolism, pain perception, or central fatigue signaling.

A state of heightened physical and mental energy characterized by increased wakefulness, elevated motivation, and a subjective sense of vigor that pervades both body and mind. Users often report feeling electrically alive, with a buzzing readiness to move, talk, and engage that can range from a pleasant caffeine-like lift to an overwhelming, jittery compulsion to act.

A progressive decrease in the ability to feel physical touch, ranging from mild numbness to complete bodily anaesthesia. The body may feel distant or absent.

A visual phenomenon in which a faint, ghostly imprint of a previously viewed image persists in the visual field after the original stimulus has been removed or one has looked away. These lingering visual echoes are significantly more persistent, vivid, and detailed than normal physiological afterimages, often retaining color and form for several seconds or longer and overlaying themselves onto whatever one currently views.

Perceived increase or decrease in environmental brightness beyond actual illumination levels, common with stimulants and psychedelics (brightening) or sedatives (darkening).

An intensification of the brightness, vividness, and saturation of colors in the external environment, making the world appear dramatically more colorful. Reds seem redder, greens seem greener, and all hues appear richer and more distinct than during ordinary perception.

Alterations in how the distance of objects within the visual field is perceived, causing layers of scenery to appear exaggerated, rearranged, flattened, or warped in spatial depth.

The visual experience of seeing a single object as two separate, overlapping images, similar to crossing one's eyes, ranging from subtle ghosting to complete inability to perceive fine detail.

The visual experience of perceiving stationary objects, textures, and surfaces as appearing to flow, breathe, melt, or shift in position. Drifting is one of the most fundamental and commonly reported visual distortions under the influence of psychedelic substances, serving as the perceptual foundation upon which many other visual effects are built. It manifests as a fluid, organic sense of motion embedded in otherwise static visual fields.

A visual distortion in which the environment and objects within it appear fragmented into geometric, cube-like facets, as if reality has been refracted through a crystalline prism. The effect gives surfaces and three-dimensional space a distinctly angular, Cubist art-like quality reminiscent of Picasso or Braque paintings, where multiple perspectives of the same object are perceived simultaneously.

A visual hallucination that manifests within the external environment as though it were physically real, ranging from subtle distortions of existing objects to fully autonomous, detailed scenes and entities that appear indistinguishable from reality.

Perception of visual motion as choppy discrete frames rather than smooth continuous flow, resembling low-FPS video, most common with dissociatives.

The experience of perceiving complex, ever-shifting geometric patterns superimposed over the visual field or visible behind closed eyelids. Geometry is widely considered the hallmark visual effect of psychedelic substances, ranging from simple lattice patterns and honeycombs at low doses to infinitely complex, self-transforming fractal structures at high doses that can feel profoundly meaningful and awe-inspiring.

Vivid, detailed visual experiences perceived within an imagined mental landscape that can only be seen with closed eyes, ranging from fleeting imagery and abstract scenes to fully immersive, dream-like environments with autonomous narratives and entities.

A hallucinatory phenomenon in which the observer's visual perspective shifts from the normal first-person viewpoint to alternative vantage points — including third-person (seeing oneself from outside), bird's-eye, or omniscient perspectives — during both internal and external hallucinations.

The visual field fractures into distinct, cleanly cut sections that slowly drift apart from their original positions before resetting, as if reality has been sliced by an invisible blade into geometric pieces that briefly separate and rearrange.

The perceived environment in which hallucinatory experiences take place, ranging from recognizable locations drawn from memory to entirely novel alien landscapes, ancient civilizations, cosmic vistas, and impossible architectural spaces.

Textures appear to mirror and tessellate across surfaces in intricate, self-similar symmetrical patterns that maintain detail at every scale. Most prominent in peripheral vision on rough surfaces.

A dissociative visual effect involving a progressive detachment from visual perception, ranging from minor suppression and blurring at lower levels to a complete perceptual blackout and immersion in a dark hallucinatory void at higher levels.

A translucent fog or haze overlays the visual field, softening the environment and reducing clarity. May appear colorless or tinted, giving surroundings a dreamlike atmosphere.

A complete or partial inability to form new memories or recall existing ones during and after substance use, ranging from minor gaps in recollection to total blackouts encompassing hours of experience.

Analysis suppression is a cognitive impairment in which the capacity for logical reasoning, critical evaluation, and systematic problem-solving is significantly diminished — leaving the person unable to effectively break down, examine, or draw conclusions about even relatively simple ideas or situations.

Intense feelings of apprehension, worry, and dread that can range from a subtle background unease to overwhelming panic attacks with a sense of impending doom, often amplified by the substance's intensification of one's existing mental state.

A partial to complete suppression of anxiety and general unease, producing a calm, relaxed mental state free from worry. This can range from subtle tension relief to a profound sense of inner peace and emotional security.

Cognitive disconnection is the experience of feeling profoundly detached from one's own thoughts, sense of identity, and mental processes — as though awareness has been severed from the cognitive systems that normally generate the feeling of being a coherent, thinking self.

A cognitive and emotional state of intense well-being, elation, happiness, and joy that manifests as a profound mental contentment and positive outlook. This ranges from gentle feelings of optimism and warmth to overwhelming bliss that pervades all thoughts and perceptions.

A shift in the nature of thought from verbal, linear sentence structures to intuitive, non-linguistic concepts that are felt and understood rather than spoken by an internal narrator.

An increase in the ability to imagine new ideas, overcome creative blocks, think about existing concepts in novel ways, and produce artistic or intellectual work with greater fluency and inspiration.

Intense, often prolonged sensation of having already experienced the current moment, common with psychedelics and dissociatives.

A delusion is a fixed, false belief that is held with unshakeable certainty and is impervious to contradicting evidence or rational argument — often involving grandiose, persecutory, or bizarre themes that are clearly at odds with observable reality.

A detachment from one's own sense of self, body, or mental processes, as if observing oneself from outside or feeling that one's actions, thoughts, and identity are automatic and unreal.

A persistent state of low mood, emotional numbness, hopelessness, and diminished interest or pleasure in activities, often occurring during comedowns, withdrawal, or as a prolonged after-effect of substance use.

A perceptual disturbance in which the external world feels profoundly unreal, dreamlike, or artificially constructed, as though experienced through a veil, screen, or foggy barrier separating the observer from reality.

A marked reduction in social inhibitions, self-consciousness, and behavioral restraint that manifests as increased openness, talkativeness, and willingness to engage in activities one would normally avoid. Users often describe feeling as though an invisible social barrier has been lifted, allowing thoughts and impulses to flow directly into action without the usual filtering process.

Dream suppression is a decrease in the intensity, frequency, and recollection of dreams — ranging from dreams becoming vaguer and less vivid to the complete cessation of any remembered dream activity — most commonly produced by substances that alter REM sleep architecture.

Feelings of impending doom is the sudden onset of an overwhelming, visceral certainty that something terrible is about to happen — often one's own death, a medical crisis, or the end of the world — despite the absence of any rational basis for this belief.

A heightened capacity to become fully absorbed and engrossed in external media such as music, films, video games, and art, with an amplified suspension of disbelief and a deepened emotional connection to the content being experienced.

An enhanced state of self-reflective awareness in which one feels drawn to examine their own thoughts, emotions, behaviors, and life patterns with unusual depth, clarity, and emotional honesty, often yielding insights that feel therapeutically significant.

Abnormally elevated mood, energy, and activity with impulsive behavior and grandiosity, associated with stimulant use and certain drug interactions.

A dose-dependent inhibition of one's ability to access and utilize short-term and long-term memory, ranging from mild forgetfulness to a profound inability to recall personal identity, biographical information, or the context of the current experience.

Mindfulness in the substance context refers to a state of heightened present-moment awareness in which attention is fully directed toward immediate experience — thoughts, sensations, emotions — with an attitude of non-judgmental observation, while the usual stream of planning, worrying, and self-referential thinking quiets substantially.

A heightened sense of drive, ambition, and willingness to accomplish tasks, making productive effort feel rewarding and almost effortless.

Personal meaning enhancement is a state in which everyday events, coincidences, song lyrics, environmental details, and social interactions seem to carry profound and specific personal significance — as if the universe is communicating directly with the experiencer through symbolism and synchronicity.

Psychosis is a serious psychiatric state involving a fundamental break from consensus reality — characterized by firmly held false beliefs (delusions), perception of things that are not there (hallucinations), disorganized thought and speech, and a loss of the ability to distinguish internal mental events from external reality.

The experience of thoughts occurring at a markedly reduced pace, as if the mind has been placed into slow motion. Internal dialogue becomes sparse and sluggish, with each idea taking longer to form and process, producing a sense of mental heaviness or cognitive inertia.

Subjective perception of time becomes dramatically altered — minutes may feel like hours, or hours pass in moments. Can manifest as either dilation or compression.

Auditory distortion is the experience of sounds becoming warped, pitch-shifted, flanged, or otherwise altered in their perceived qualities without any change to the actual sound source. Familiar sounds may seem alien, stretched in time, or layered with unusual resonances, creating a surreal and sometimes unsettling soundscape that departs significantly from sober auditory perception.

Auditory enhancement is a heightened sensitivity and appreciation of sound in which music, voices, and ambient noise become richer, more detailed, and more emotionally resonant. Subtle sonic details that would normally go unnoticed — the texture of a guitar string, the breath between a singer's words, the layered harmonics of a chord — become vivid and captivating.

Auditory hallucination is the perception of sounds that have no external source — hearing music, voices, environmental noises, or abstract sonic phenomena that exist entirely within the mind. These range from faint, ambiguous whispers at the edge of perception to fully formed, complex musical compositions or conversational speech that can feel completely real and externally sourced.

Auditory misinterpretation is the brief, spontaneous misidentification of real sounds as entirely different sounds — ambient noise interpreted as voices, mechanical hums perceived as music, or random environmental sounds heard as words or familiar patterns.

A dampening of auditory perception in which sounds become muffled, distant, and reduced in both volume and clarity, as though hearing through thick walls or underwater. This creates a cocoon-like sense of auditory isolation.

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.

Machinescapes are complex multisensory hallucinations involving the perception of enormous mechanical landscapes built from interlocking gears, pulleys, conveyor belts, and other industrial components, often felt as extensions of or replacements for one's own body.

Memory replays are vivid, multisensory re-experiences of past events that go far beyond normal recall — the person doesn't just remember an event but relives it as an immersive hallucination, complete with sights, sounds, emotions, and physical sensations from the original experience.

Scenarios and plots are the narrative structures that emerge within hallucinatory states — coherent or surreal storylines involving autonomous characters, unfolding events, and immersive settings that can feel as real and consequential as waking life.

A profound dissolution of the sense of self in which personal identity, memories, and the boundary between self and world completely vanish, leaving only pure undifferentiated awareness.

A sudden, visceral realization of the profound significance and improbability of one's own existence as a conscious being within the universe, often accompanied by overwhelming awe and a fundamental shift in perspective about life and reality.