Dissociatives
Memantine (Namenda)
Street names: Namenda, NMDA antagonist, The week-long disso
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- NMDA antagonist like ketamine but DAYS long: recreational mega-doses produce multi-day dissociation with manic energy
- Nootropic-scene microdosing claims
⚠Key risks
- THE DURATION: 60–100 h half-life — a 'trip' becomes a 3–5 day commitment; redosing stacks into weeks of detachment
- Mania and functional impairment lasting days; users have lost jobs/relationships mid-experiment
- Alzheimer's-drug turned grey-market dissociative; little recreational safety data
- Bladder/kidney class concerns at chronic high dose
✚Overdose signs
- Days-long dissociation
- Manic behavior
- Cognitive shutdown
📋Quick facts
Also known asNamenda, NMDA antagonist, The week-long disso
CategoryDissociatives
Schedule / classRx-only (Alzheimer's) — not controlled
Appearance5–28 mg tablets (XR available)
Street price~$0.50–$2 per tablet grey-market
Legal statusRx-only; grey-market nootropic use unregulated
Last updated2026-09-18
Sources: FDA, Erowid
Category comparison — Dissociatives
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Memantine (Namenda) | Rx-only | THE DURATION: 60–100 h half-life — a 'trip' becomes a 3–5 day commitment; redosing stacks into weeks of detachment; Mania and functional impairment lasting days; users have lost jobs/relationships mid-experiment | ~$0.50–$2 per tablet grey-market |
| Ketamine | Schedule III | Bladder damage (ketamine cystitis) with regular use; K-holes and accidents while impaired | ~$20–$60 per gram |
| DXM (Dextromethorphan / Robotripping) | OTC | Serotonin syndrome — DXM is serotonergic; DEADLY with SSRIs, MAOIs, MDMA; Liver damage — Coricidin contains chlorpheniramine (antihistamine) that's hepatotoxic at abuse doses | ~$5–$12 per bottle |
| Arylcyclohexylamine RCs (3-HO-PCP, 3-MeO-PCE, DCK, O-PCE) | Analogue prosecutions | MANIA + dangerous disinhibition (3-HO-PCP especially): users hurt themselves while detached; Functional dissociation — appear sober, drive impaired | ~$25–$60/g |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does Memantine (Namenda) look like?
5–28 mg tablets (XR available)
What are the signs of a Memantine (Namenda) overdose?
Days-long dissociation; Manic behavior; Cognitive shutdown Call emergency services immediately.
How addictive is it?
THE DURATION: 60–100 h half-life — a 'trip' becomes a 3–5 day commitment; redosing stacks into weeks of detachment Dependence can develop with regular use.