Anaesthetic drug used by doctors and vets. Effects are usually felt in 1 min if injected, 5-15 mins if snorted, and 30 mins if swallowed. Can be swallowed, snorted or injected. Sometimes smoked with cannabis or tobacco.

This is a guide only – know more, be safer.

Effects on the Brain

How Ketamine makes you feel

Depends on how you feel before you use ketamine, and the surroundings you’re in. You might feel happy, relaxed, confused, anxious, panicked, aggressive, or feel detached from your body – known as a ‘k-hole’.

Effects on the Body

What Ketamine does to your body

Depends on your size/weight and health, if you’re used to taking it, if other drugs are taken around the same time, amount taken, and drug strength. You might experience hallucinations, clumsiness, vomiting, slurred speech, blurred vision, increased heart rate and blood pressure, or lowered sensitivity to pain.

Drug Duration Calculator
Staying Safe

How long does Ketamine last?

Effects last
1 - 1.5 hours
Stays in your system for
In system
Saliva test: Less than 24 hours. Urine test: 48-72 hours
No longer detectable in your system
72+ hours

Depends on:

Can last around 1 hour. But you can be affected by disorientation, memory loss or anxiety for up to 1 day after use.

Calculate the duration of other substances

How do you stay below 0.05? (This is a guide only)

Men average size: No more than 2 standard drinks in the first hour and 1 drink per hour after that.

Women average size: No more than 1 standard drink per hour.

Mixing Substances

Risks of mixing Ketamine with other substances

Mixing ketamine with other drugs can have unpredictable effects and increase the risk of harm.

Moderate risk icon

Moderate Risk Substances

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High Risk Substances

Potential Side Effects

When you take too much Ketamine

Increased blood pressure

Increased heartbeat



Staying Safe

Risks when taking the substance

  • High risk of physical harm/accidents
  • Hurting yourself without knowing you have done so
  • Repeated use over a long period of time can cause the painful ketamine bladder syndrome (difficulty holding in urine, incontinence, which can cause ulceration in the bladder).
Staying Safe

Harm reduction

  • Avoid using alone
  • Use with people you trust and in a safe place
  • Always start small and find safe dose
  • Make sure the drug is crushed into a fine powder so it doesn’t cause cuts
  • Don’t use bank notes to snort, have your own straw or spoon so you can avoid infection and blood borne viruses
  • Snorting drugs repeatedly over time can injure the nose, remember to take breaks
  • You can snort water before and after use to reduce infection risk
  • Don’t use if you have mental health issues
  • Know how long ketamine stays in your system so you’ll know when it’s safer to drive, be on site or work machinery.