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Diazepam is one of the best-known benzodiazepines and works quickly against anxiety, tension and muscle spasms. Because diazepam and its active breakdown product nordazepam stay in the body for days, it builds up with regular use – especially in older age, with consequences for steadiness on your feet, memory and the risk of dependence. According to the SmPC, the rule is therefore: as low a dose and as short a course as possible.
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With diazepam, two kinds of interaction matter: anything that further increases the dampening of the brain and breathing, and anything that slows down or speeds up its breakdown in the liver via the enzymes CYP3A4 and CYP2C19.¹
| Combination | Consequence | What to do |
|---|---|---|
| Opioids such as tramadol, tilidine, oxycodone or morphine | Heavy sedation, depressed breathing, coma, in the worst case death | According to the SmPC, only if there is no alternative — lowest dose, shortest duration, close observation |
| Alcohol | Unpredictably increased sedation, depressed breathing, falls | Avoid |
| Sleeping tablets such as zolpidem or zopiclone, other benzodiazepines | Double sedation, memory gaps, falls | Have the combination reviewed critically |
| Sedating antidepressants, antipsychotics, anti-epileptic medicines such as pregabalin, sedating antihistamines, lithium | They increase each other’s drowsiness | Have the overall burden assessed by a doctor |
| Acid blockers such as omeprazole, cimetidine, fluvoxamine, fluoxetine, ketoconazole, disulfiram | Slower breakdown, stronger and longer effect | Watch for increasing drowsiness, have the dose checked |
| Phenytoin, phenobarbital | Faster breakdown of diazepam | Have the effect and levels assessed by a doctor |
| Muscle relaxants such as baclofen | Increased muscle relaxation and weakness | Watch for unsteadiness |
| Levodopa | The effect of levodopa can be weakened | In Parkinson’s disease, watch your mobility |
| Sodium oxybate, HIV protease inhibitors | Increased effect | Only in coordination with a specialist |
| Smoking | Speeds up elimination | When you stop smoking, the effect can increase |
The most dangerous combination is the one with opioids. Both dampen the respiratory centre, and together their effects do not just add up — they can amplify each other. The SmPC contains a separate warning about this.¹ A typical situation creeps up gradually: diazepam from the GP practice for restlessness, tilidine or tramadol from the orthopaedic practice for back pain, plus a glass of wine in the evening. If you take both, your relatives should know the warning signs: barely rousable, slow breathing or breathing that pauses.
The second trap is acid blockers. Omeprazole and esomeprazole slow down the enzyme CYP2C19, which breaks diazepam down. As a result, the effect can last longer — unnoticed, because hardly anyone links their stomach protection to morning drowsiness. An interaction check across your whole list, including over-the-counter sleep and allergy remedies, makes such connections visible.
Both are benzodiazepines with a similar potential for dependence. The most important difference is the duration of action: lorazepam has an intermediate half-life and no long-lived active breakdown products. It builds up less but acts for a shorter time — with the risk of gaps in effect and noticeable cravings between doses. Diazepam acts more evenly but stays in the body for days. With liver disease and in older age, an active ingredient without long-acting breakdown products is therefore often preferred — if a benzodiazepine is needed at all.
| Active ingredient | Duration of action | Typical use | Typical drawback |
|---|---|---|---|
| Diazepam | Long, active breakdown product nordazepam | Acute anxiety and agitation, muscle spasms, seizures, before procedures | Build-up, hangover, fall risk in older age |
| Lorazepam | Intermediate | Acute anxiety and panic, crises in psychiatry | Gaps in effect, cravings between doses |
| Z-drugs such as zopiclone | Short | Short-term treatment of sleep problems | Tolerance and dependence also possible |
For the long-term treatment of anxiety disorders, the German S3 guideline does not recommend benzodiazepines. What works there is above all psychotherapy, especially cognitive behavioural therapy, and certain antidepressants; benzodiazepines are only an option in exceptional cases and for a limited time.⁴ The same applies to panic disorder. For sleep disorders, cognitive behavioural therapy for insomnia is the first-choice treatment. The guides alternatives to sedatives and sleeping pills: what really helps give an overview of medicinal and non-medicinal approaches.
Possibly, even if you have never increased the dose. Many people with low-dose dependence do not see themselves as addicted, because they never wanted more. One clue is what happens when the tablet is missed: do you then sleep much worse, feel restless or shaky? That is not a personal failure but the expected adaptation of the brain. Raise the question openly with your practice. The goal is a joint, slow plan — not an abrupt stop out of a guilty conscience.
That may well be related to diazepam, especially if she has only recently started taking it or the dose has been increased. In older age, it builds up more, and the full effect often only shows after one to two weeks. Write down when the changes began, whether there have been falls or near-falls and which medicines have been added recently. With this list, the practice can check whether the dose should be lowered or the medicine replaced. In the case of sudden severe confusion, she should see a doctor the same day.
That is a typical stopping phenomenon. Because of the long half-life, withdrawal and rebound symptoms with diazepam often set in with a delay — sometimes only after several days, when you already think you have got through it. Contact your practice promptly. Sometimes it makes sense to restart at a small dose and then taper off slowly. If tremor, severe anxiety, perceptual disturbances or even a seizure occur, you need medical help immediately.
Some practices switch to a long-acting benzodiazepine such as diazepam for tapering. The idea behind it: the level fluctuates less, the intervals between doses become longer and the reduction can be planned in finer steps. Whether this works better in an individual case than slowly tapering the previous medicine has not been clearly proven. What matters is that the switch does not end up as a permanent solution but is part of a plan with a goal.
The interaction check reviews your whole list, including over-the-counter sleep and allergy remedies.
