Stimulant · substituted-amphetamine
Methamphetamine
aka Crystal · Crystal Meth · Tina · Ice · Yaba · Shabu · T · Glass · Meth
Last verified
Crystal meth is in a different league from regular speed. The molecule is one methyl group away from amphetamine but the experience, the duration, the crash and the addiction profile are all noticeably harder. Treat it as a separate substance, not a stronger version of something you already know.
In Europe the typical pattern is insufflated or smoked, in long stretched sessions of 12–48 hours. In the Asian chemsex scene the smoked or injected (slamming) route dominates and pushes risk further still. Whatever the route, the half-life of about 10 hours means a single redose late in the night can keep you up the entire next day.
Harm reduction
- Start lower than you think. If you have only ever used amphetamine, your reference dose for the first time is probably 5–10 mg. Crystal hits harder per mg and lasts roughly twice as long.
- Set a hard stop time before you start, and put away the bag once you reach it. Decisions you make at hour 18 are not the same as the ones you made at hour 2.
- Test with Marquis + Simon. Marquis tells you it is an amphetamine-class substance; Simon distinguishes meth from regular amphetamine (positive for meth, negative for amp). PMMA and other para-substituted analogues will fool a single reagent.
- Hydrate and eat anyway. Salt, sugar, water — even when you don't feel hungry. Six to twelve hours in, your body has burned through what was on board and is running on stored glycogen and adrenaline.
- Magnesium glycinate 200–400 mg helps with jaw tension and cramps. Don't pair with stimulant doses; take it at the start and again at any planned cool-off.
- No SSRIs, no MAOIs, no tramadol. Serotonin-syndrome risk is real, and meth is already pushing the same monoamine systems hard.
- Watch the cardiovascular limit. Resting HR over 130 sustained, BP over 180/110, chest tightness, or numbness in arms or jaw: stop, sit, cool, drink electrolytes. If symptoms persist 20 minutes, call emergency services and tell them what is on board. they cannot help you if they don't know.
- Sleep is the antidote. Trazodone or olanzapine (if you have access) bring you down faster than diphenhydramine without the next-day fog. Cannabis can take the edge off too but doesn't replace sleep.
- Mind the slamming switch. People who only ever snorted or smoked rarely escalate to injection. People who used to inject pretty much always have a faster road to a problem if they start again. Decide once, in advance.
- If you are in chemsex contexts, condoms degrade faster, lube use changes, and consent gets fuzzy after hour 12. Have your tests and your PrEP plan sorted before you start the session, not during it.
Dosage.
Insufflated
- Threshold
- 5 mg
- Light
- 5–15 mg
- Common
- 15–40 mg
- Strong
- 40–60 mg
- Heavy
- 60 mg
Oral
- Threshold
- 5 mg
- Light
- 10–20 mg
- Common
- 20–40 mg
- Strong
- 40–75 mg
- Heavy
- 75 mg
Smoked
- Threshold
- 5 mg
- Light
- 5–15 mg
- Common
- 15–30 mg
- Strong
- 30–50 mg
- Heavy
- 50 mg
| Route | Threshold | Light | Common | Strong | Heavy |
|---|---|---|---|---|---|
| Insufflated | 5 mg | 5–15 mg | 15–40 mg | 40–60 mg | 60 mg |
| Oral | 5 mg | 10–20 mg | 20–40 mg | 40–75 mg | 75 mg |
| Smoked | 5 mg | 5–15 mg | 15–30 mg | 30–50 mg | 50 mg |
Start at the bottom. Body chemistry, tolerance, and combinations all matter.
Duration.
Insufflated
total ~ 2290 min- Onset
- 5–10 min
- Peak
- 3–6h
- Offset
- 3–8h
- After
- 12–24h
Oral
total ~ 2460 min- Onset
- 20–60 min
- Peak
- 4–8h
- Offset
- 4–8h
- After
- 12–24h
Smoked
total ~ 2161 min- Onset
- 0–1 min
- Peak
- 2–4h
- Offset
- 3–8h
- After
- 12–24h
Effects.
Positive
- Sharp euphoria and confidence
- Pronounced libido increase
- Drive to work, talk, fix, organise
- Reduced appetite and need for sleep
Neutral
- Pupil dilation
- Jaw clenching, teeth grinding
- Dry mouth
- Heightened sensory focus, particularly auditory
Negative
- Strong cardiovascular load (HR, BP)
- Anxiety, paranoia, scripting / patterns
- Tactile hallucinations ("meth bugs") on prolonged binges
- Steep dopamine crash 6–24 h after last dose
- High addiction potential, especially smoked or injected
Interactions.
Heads up
Many drug combinations are unsafe even at low doses. When in doubt, take less or abstain. Always cross-check with the interaction checker tool.
Dangerous
Combination may cause serious harm. Avoid.
- maois
- dxm
Unsafe
Substantial risk. Combination not recommended.
- cocaine
- mdma
- amphetamine
- alcohol
- ssris
- tramadol
Caution
Mild interaction. Use with reduced doses.
- cannabis
- ghb
- ketamine
- opioids
Testing.
- ReagentMarquisExpected reactionOrange to brown (slow)
- ReagentMeckeExpected reactionFaint blue-green
- ReagentMandelinExpected reactionOrange
- ReagentSimonExpected reactionBlue (confirms secondary amine; distinguishes meth from amphetamine, which is negative)
- ReagentFroehdeExpected reactionNo reaction
| Reagent | Expected reaction |
|---|---|
| Marquis | Orange to brown (slow) |
| Mecke | Faint blue-green |
| Mandelin | Orange |
| Simon | Blue (confirms secondary amine; distinguishes meth from amphetamine, which is negative) |
| Froehde | No reaction |
Cross-check with a secondary reagent. Tests tell you what something isn't, not always what it is.
Legal status.
- DEGermanyIllegal
- ATAustriaIllegal
- CHSwitzerlandIllegal
- NLNetherlandsSchedule I
- BEBelgiumIllegal
- LULuxembourgIllegal
- FRFranceIllegal
- ESSpainIllegal
- PTPortugalDecriminalised
- ITItalySchedule I
- PLPolandIllegal
- CZCzechiaIllegal but tolerated
- SESwedenIllegal
- DKDenmarkIllegal
- NONorwayIllegal
- FIFinlandIllegal
- IEIrelandClass A
- UKUnited KingdomClass A
- USUnited StatesSchedule II
- CACanadaSchedule I
- AUAustraliaSchedule 8
- TRTurkeyIllegal
- NZNew ZealandClass A
- BRBrazilIllegal
- MXMexicoIllegal
| Country | Status |
|---|---|
| DEGermany | Illegal |
| ATAustria | Illegal |
| CHSwitzerland | Illegal |
| NLNetherlands | Schedule I |
| BEBelgium | Illegal |
| LULuxembourg | Illegal |
| FRFrance | Illegal |
| ESSpain | Illegal |
| PTPortugal | Decriminalised |
| ITItaly | Schedule I |
| PLPoland | Illegal |
| CZCzechia | Illegal but tolerated |
| SESweden | Illegal |
| DKDenmark | Illegal |
| NONorway | Illegal |
| FIFinland | Illegal |
| IEIreland | Class A |
| UKUnited Kingdom | Class A |
| USUnited States | Schedule II |
| CACanada | Schedule I |
| AUAustralia | Schedule 8 |
| TRTurkey | Illegal |
| NZNew Zealand | Class A |
| BRBrazil | Illegal |
| MXMexico | Illegal |
Information, not legal advice. Status varies by region and changes over time.
FAQ.
How long does Methamphetamine last?
A typical oral Methamphetamine experience peaks around 240–480 minutes and then tails off, with after-effects that can run several hours. The exact window depends on dose, body weight and what else you've eaten or taken.
Can you overdose on Methamphetamine?
Yes. Higher doses sharply raise the risk of acute harm (cardiovascular strain, hyperthermia, serotonin issues for serotonergic drugs, respiratory depression for downers). Stick to the lowest dose that gives you the effect you're after, never re-dose blindly, and use our [dose calculator](/tools/dosage-calculator) before you weigh anything out.
Is Methamphetamine addictive?
Methamphetamine can produce psychological dependence with frequent use, especially in unstable settings or when used to self-medicate. Physical dependence varies by substance class; the safest pattern is occasional use with long breaks (often 4–6 weeks minimum) and an honest read on why you're reaching for it.
What does Methamphetamine feel like?
Common subjective effects include the ones listed in the Effects section above. Set and setting massively shape the experience: a calm space, trusted people, food eaten, sleep the night before, and your own current mood all matter more than most people expect.
Can you mix Methamphetamine with alcohol?
Mixing with alcohol is rarely a good idea. it dulls your judgement of how much you've taken, dehydrates you, and stacks cardiovascular load. If alcohol is on the table, drink less than normal, alternate with water, and run the combination through our [interaction checker](/tools/interaction-checker) first.
How do I test Methamphetamine at home?
A basic reagent kit (Marquis + Mandelin + Mecke for most stimulants/entactogens; Ehrlich for tryptamines) gives you a fast presence check. It does NOT measure dose or purity, but it does rule out the most dangerous misrepresentations. See the [reagent guide](/tools/reagent-guide) for expected colors per reagent.
How much Methamphetamine is too much?
There's no single number that applies to everyone. As a rule, anything above the 'strong' dose range (40-75 mg for the primary route) carries sharply higher risk of acute harm. Start low, don't redose blindly, and remember that purity varies batch to batch.
How long until Methamphetamine kicks in?
Onset is typically 20-60 minutes via the primary route. Don't redose because you 'don't feel anything yet.' Many people have overdone it by stacking doses during the come-up window.
Can you build tolerance to Methamphetamine?
Yes. Regular use builds tolerance, meaning you need more for the same effect. This escalation increases both health risk and dependence potential. The best counter is long breaks between sessions (2-4 weeks minimum for most substances, 3 months for MDMA-class drugs).
Is Methamphetamine tested for in standard drug screens?
Yes. Methamphetamine is typically detected under the amphetamines category in standard SAMHSA-5 panels. Urine detection window is roughly 3-5 days. See our [detection guide](/news/how-long-does-methamphetamine-stay-in-your-system) for full details.