Can you become dependent on prescribed cannabis?

This is the question people are most reluctant to ask and most deserve a straight answer to. Tolerance develops in many people. Dependence is possible. Neither is a reason to avoid treatment, and both are reasons to have a prescriber who is paying attention.

Tolerance

Repeated exposure to THC leads the body to reduce the availability of the receptors it acts on. The practical result is that the same amount produces less effect over time.

This affects different effects differently. Tolerance to the intoxicating and sedating effects tends to develop relatively quickly; whether tolerance to a therapeutic effect develops at the same rate is less clear and probably varies. In practice this can cut two ways: some of the unwanted early effects, such as drowsiness, may ease partly because of tolerance, while the benefit you are treating for may or may not fade at the same pace. It is one of the reasons treatment is monitored over time rather than set and forgotten.

The important clinical signal is a pattern of needing steadily more for the same result. That is a prompt to review the treatment — possibly a planned break, possibly a change of route, possibly a conclusion that it is not working — rather than to keep increasing. A planned break can allow some of the tolerance to reverse, so that a lower amount works again afterwards, but whether that is sensible for you is a decision to make with your prescriber rather than alone. The one response to avoid is quietly climbing the dose to stay ahead of it.

Dependence

Dependence means the body has adapted to the presence of the drug, so stopping produces withdrawal symptoms. It can develop with prescribed use, and it is more likely with higher exposure over longer periods.

It is worth separating two things that get conflated. Physical dependence is a predictable pharmacological adaptation that happens with many medicines, including ones nobody worries about. Problematic use — craving, loss of control, continuing despite harm — is a different and less common phenomenon.

Risk is higher with a personal or family history of substance use problems, with daily high exposure, and where the medicine is being used for a purpose it was not prescribed for. A prescriber should be asking about all three, and honest answers get you better care. None of these on its own decides the question; they are weighed together, alongside the potential benefit, when a specialist judges whether treatment is appropriate and how closely to monitor it. Being open about them does not count you out — it lets the treatment be set up more safely.

What withdrawal is like

Cannabis withdrawal is genuinely unpleasant and not medically dangerous in the way alcohol or benzodiazepine withdrawal can be. Symptoms usually begin within a day or two of stopping and ease over one to two weeks.

• Irritability, restlessness or low mood
• Difficulty sleeping, and vivid or disturbed dreams
• Reduced appetite
• Sweating, chills or headache
• A return of the original symptom, which can be hard to distinguish from withdrawal

That last point matters. When someone stops and their pain or anxiety returns, it is not always obvious whether the underlying condition has resurfaced or whether this is withdrawal. Reducing gradually rather than stopping abruptly helps separate the two, because withdrawal tends to appear soon after stopping and then fade over a week or two, whereas the underlying condition, if it returns, usually stays. A written record of symptoms through the reduction makes that distinction far easier to draw, both for you and for your prescriber.

Stopping properly

Plan it with your prescriber. Abrupt stopping is the route most likely to produce an unpleasant experience and a misleading conclusion about whether treatment was helping.

1. Tell your prescriber you want to stop, and why — the reason changes the plan
2. Agree a gradual reduction rather than stopping at once
3. Pick a period without major stressors where you can
4. Keep a record of symptoms so withdrawal and the underlying condition can be told apart
5. Agree what happens if symptoms return, so there is a plan rather than a crisis

Stopping is also the correct outcome of a trial that has not worked, and there is nothing wrong with reaching it. A prescriber who treats stopping as a failure, or who has no plan for it, is not managing the treatment well.

Keeping tolerance in check

Because tolerance can lead to a slow upward creep in dose, part of managing treatment well is noticing that pattern early and responding to it rather than simply increasing.

The signal to watch for is needing steadily more to get the same result. When that happens, chasing it with ever-larger amounts tends to bring more side effects rather than more benefit, and it can accelerate tolerance further. The alternative is to treat it as information: a prompt to review the plan with your prescriber. Options a specialist may consider include holding the dose, a planned break, a change of route or preparation, or concluding that the treatment has run its course. Which of these fits is a clinical judgement, made with you.

This is also why the low-and-slow approach at the start matters beyond the first few weeks. Finding the smallest amount that helps, and staying there, is not only about side effects; it leaves more room to respond if tolerance develops later. The starting process is covered in how a dose is decided and adjusted, and the effects that escalation tends to bring in side effects of cannabis-based medicines.

Questions worth asking your specialist

Tolerance, dependence and stopping are easier to handle when they have been discussed before they arise. Useful questions include:

• How will we tell the difference between tolerance developing and the treatment simply not working?
• At what point would you review the plan rather than simply increase the dose?
• What is the plan for stopping, and how gradually would we do it?
• How would we tell withdrawal apart from my condition returning?
• What should I do if I am struggling to cut down, or feel I have lost control of my use, and who can I turn to?

A prescriber who can answer these, and who builds a review and an exit into the plan from the start, is managing the treatment as it should be managed. If use ever feels like it is slipping beyond a prescription, the NHS offers confidential help, and raising it early is far easier than leaving it.

Patient guide · Written by the Flora House editorial team · Last reviewed: 7 October 2026