Crystal methamphetamine close up

Last published: November 23, 2023

What is ice?

Crystal methamphetamine (‘ice’, ice drug) is a stimulant drug, which means it speeds up the messages travelling between the brain and the body. It’s stronger, more addictive and therefore has more harmful side effects than the powder form of methamphetamine known as speed.1

Ice usually comes as small chunky clear crystals that look like ice. It can also come as white or brownish crystal-like powder with a strong smell and bitter taste.1

Other names

Crystal meth, shabu, crystal, glass, shard, P.1,2

How is it used?

Ice is generally smoked (feel the effect almost immediately) or injected (15 to 30 seconds to feel the effects). It is sometimes swallowed (15 to 20 minutes to feel the effects) or snorted (3 to 5 minutes to feel the effects).3

Effects of ice

There is no safe level of drug use. Use of any drug always carries some risk. It’s important to be careful when taking any type of drug.

The effects of ice can last for up to 12 hours,2 but it might be hard to sleep for a few days after using the drug.

Ice affects everyone differently, but effects may include:

  • feelings of pleasure and confidence
  • increased alertness and energy
  • repeating simple things like itching and scratching
  • enlarged pupils and dry mouth
  • teeth grinding and excessive sweating
  • fast heart rate and breathing
  • reduced appetite
  • increased sex drive.1,3,4,5

If injecting drugs there is an increased risk of:

  • tetanus
  • infection
  • vein damage.

If sharing needles there is an increased risk of:

  • Hepatitis B
  • Hepatitis C
  • HIV and AIDS.1

Snorting ice can damage the nasal passage and cause nose bleeds.


If you take a large amount or have a strong batch, you could overdose. Call an ambulance straight away by dialling triple zero (000) if you have any of these symptoms (ambulance officers don’t need to involve the police):

  • racing heartbeat and chest pain
  • breathing problems
  • fits or uncontrolled jerking
  • extreme agitation, confusion, clumsiness
  • sudden, severe headache
  • unconsciousness
  • stroke, heart attack or death.1,4,6

Coming down

It can take several days to come down from using ice. The following effects may be experienced during this time:

  • difficulty sleeping and exhaustion
  • headaches, dizziness and blurred vision
  • paranoia, hallucinations and confusion
  • irritability and feeling ‘down’.1,4

Using a depressant drug such as alcohol, benzodiazepines or cannabis to help with the come-down effects may result in a cycle of dependence on both types of drugs.

Long-term effects

With regular use, ice may eventually cause:

  • extreme weight loss due to reduced appetite
  • restless sleep
  • dry mouth and dental problems
  • regular colds or flu
  • trouble concentrating
  • breathlessness
  • muscle stiffness
  • anxiety, paranoia and violence
  • depression
  • heart and kidney problems
  • increased risk of stroke
  • needing to use more to get the same effect
  • dependence on ice
  • financial, work or social problems.4,7

Ice psychosis

High doses of ice and frequent use may result in a psychological condition known as ‘ice psychosis’, characterised by paranoid delusions, hallucinations and bizarre, aggressive or violent behaviour. These symptoms usually disappear a few days after the person stops using ice.1,4


People who regularly use ice can quickly become dependent on the drug. They may feel they need ice to go about their normal activities like working, studying and socialising, or just to get through the day.1,5

Mental health problems

Some people who regularly use ice may start to feel less enjoyment of everyday activities. They can get stressed easily and their moods can go up and down quite quickly. These changes can lead to longer-term problems with anxiety and depression. People may feel these effects for at least several weeks or months after they give up ice.8

Mixing ice with other drugs

The effects of taking ice with other drugs − including over-the-counter or prescribed medications − can be unpredictable and dangerous, and could cause:

  • Ice + speed or ecstasy: enormous strain on the heart and other parts of the body, which can lead to stroke.9
  • Ice + alcohol, cannabis or benzodiazepines: enormous strain on the body, and more likely to overdose. The stimulant effects of ice may mask the effects of depressant drugs like benzodiazepines and can increase the risk of overdose.9


Giving up ice after using it for a long time is challenging because the body has to get used to functioning without it. Withdrawal symptoms generally settle down after a week and will mostly disappear after a month. Symptoms can include:

  • cravings for ice
  • increased appetite
  • confusion and irritability
  • aches and pains
  • exhaustion
  • restless sleep and nightmares
  • anxiety, depression and paranoia.8

Getting help

If your use of ice is affecting your health, family, relationships, work, school, financial or other life situations, or you’re concerned about a loved one, you can find help and support.

Call the National Alcohol and Other Drug Hotline on 1800 250 015 for free and confidential advice, information and counselling about alcohol and other drugs

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Image of a woman walking through a maze

Use of methamphetamine (ice) is against the law. Federal and state laws provide penalties for possessing, using, making, selling, importing or exporting, or driving under the influence of methamphetamine.

The importation or exportation and the procuring of precursor drugs (such as pseudoephedrine) with the intention of manufacturing a controlled drug, is also against the law. Laws have been introduced that prevent the sale and possession of ice pipes in some states and territories.

See also, drugs and the law.


  • 6.3% of Australians aged 14 years and over have used meth/amphetamines one or more times in their life.9
  • 1.4% of Australians aged 14 years and over have used meth/amphetamines in the previous 12 months. Of these people, 57.3% report crystal or ice as main form of the drug used.9

Young people

  • Young Australians (aged 14–24) first try meth/amphetamines at 18.6 years on average.9
  • 2.4% of 12-17 year olds have tried amphetamines.10
  1. Campbell, A. (2001). The Australian Illicit Drug Guide. Melbourne: Black Inc.
  2. McKetin, R. (2016). NDARC Fact Sheet: Methamphetamine.
  3. National Institute on Drug Abuse. (2013, September). Methamphetamine.
  4. Leonard, W., Dowsett, G., Slavin , S., Mitchell, A., & Pitts, M. (2008). Crystal clear: the social determinants of gay men’s use of crystal methamphetamine in Victoria. Melbourne: Australian Research Centre in Sex, Health & Society.
  5. Brands, B., Sproule, B., & Marshman, J. (1998). Drugs and Drug Abuse (3rd ed.). Toronto: Addiction Research Foundation.
  6. Roxburgh, A., & Burns, L. (2013). Cocaine and methamphetamine related drug-induced deaths in Australia, 2013. Sydney: National Drug and Alcohol Research Centre.
  7. Lappin, J. M., Darke, S., & Farrell, M. (2017). Stroke and methamphetamine use in young adults: A review. Journal of Neurology, Neurosurgery and Psychiatry, 88, 1079-1091.
  8. Cracks in the Ice. (2018, September 19). How does ice work? Ice and the Brain.
  9. Cracks in the Ice. (2017, April 7). Using ice with other drugs.
  10. Survey 2016: Detailed findings. Canberra: Australian Institute of Health and Welfare.

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crystal, crystal meth, crystal methamphetamine, glass, shabu, shard


crystal, crystal meth, crystal methamphetamine, glass, shabu, shard