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Quetiapine is a versatile medicine that is prescribed in very different situations, from schizophrenia through bipolar disorders to depression and, in a low dose, even against sleep problems.
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What is special about quetiapine is its dose-dependent effect profile, which sets it apart from many other antipsychotics. With most other substances of this group, mainly the strength of the effect changes with the dose, with quetiapine, on the other hand, the type of effect. In a low dose, for example in the range of 25 to 100 milligrams, the blockade of the histamine receptors is in the foreground. This is the same mechanism through which many over-the-counter sleeping pills and allergy remedies also make you tired. The effect is then mainly calming and sleep-promoting, hardly antipsychotic. In a medium dose, mood-stabilising and antidepressant effects are added. These arise among other things through the effect on serotonin and noradrenaline and are used above all with bipolar depression. Only in a higher dose, which can reach up to the daily maximum amount, does quetiapine unfold its full antipsychotic effect through the stronger blockade of dopamine receptors, which is needed with schizophrenia and acute manic phases. This means: a low dose is not simply a weak antipsychotic but works qualitatively differently, namely mainly dampening. The exact dose is always set by the medical practice and increased slowly if needed. This gradual approach helps to limit side effects such as strong tiredness or dizziness at the beginning.
Because quetiapine makes you so tired in a low dose, it is sometimes prescribed against sleep problems. This sleep-promoting effect is actually a side effect that is deliberately used here. Important to know: for this use quetiapine is not approved in Germany. This is called an off-label use, with which the medical practice must inform especially thoroughly about benefits and risks and carries the liability. This use is quite controversial. The sedating effect is undisputed, but even in a low dose quetiapine can cause weight gain and metabolic changes. For pure sleep problems without an underlying mental illness there are often more suitable and better-studied remedies as well as non-drug methods. These include above all cognitive behavioural therapy for sleep problems, which is considered especially effective. An advantage over classic sleeping pills such as benzodiazepines is that quetiapine is not addictive in the classic sense, but this does not make the risks smaller. Those who take quetiapine only because of sleep should therefore regularly check with the medical practice whether the treatment still makes sense and whether a better solution comes into question.
Off-label means special information
If quetiapine is prescribed to you in a low dose against sleep problems, this happens without official approval for this purpose. This is allowed, but your medical practice should inform you especially thoroughly about benefits, risks and alternatives. Feel free to ask why quetiapine in particular is chosen and which other options there are for your sleep. Non-drug methods such as a sleep therapy are also often effective. An informed decision is especially important here.
One of the most important side effects of quetiapine, which is often underestimated in everyday life, is weight gain. It is closely connected with the histamine blockade already mentioned and the influence on appetite. It is one of the common side effects, can be pronounced and is often difficult to reverse after stopping. Some people gain noticeable weight already in the first weeks. In addition, quetiapine can raise the blood sugar and the blood fats and thus increase the risk of diabetes and cardiovascular problems. These changes are often summarised under the term metabolic syndrome. Important in the sense of honest information: these metabolic changes can also appear with a low dose, that is precisely also with the use as a sleeping pill. Therefore weight, blood sugar and blood fats should be checked medically regularly during the treatment. A conscious diet and exercise can help to counteract. It is important to address weight gain early instead of accepting it, because then solutions can be sought together with the practice, for example an adjustment of the therapy.
The strongly sedating effect is wanted when it is about sleep but can also be a burden. What helps with falling asleep can remain during the day as unpleasant drowsiness. Many people feel very tired especially at the start of the treatment or drowsy the next morning, comparable to a hangover. Therefore quetiapine is usually taken in the evening, ideally one to two hours before going to bed. Further possible side effects are dizziness and a drop in blood pressure when standing up, dry mouth, headaches and constipation. Against the dizziness it often helps to stand up slowly in the morning and not to get up too fast. More rarely, quetiapine can influence the heart rhythm, which must be considered medically with certain pre-existing conditions or in combination with other substances. Because the tiredness reduces the reaction ability, driving and operating machines can be dangerous especially in the early period. Whether and when you may drive again should be clarified medically. Many of these side effects are strongest at the beginning and often become weaker over time as the body gets used to the medicine.
The overview below shows in simplified form how the effect changes with the dose. It serves only for understanding and is not a dosing recommendation, because the right dose is always set individually by the medical practice. The transitions between the ranges are also fluid and differ from person to person.
| Dose range | Effect in the foreground | Typical use |
|---|---|---|
| Low | Calming, sleep-promoting (histamine) | Off-label with sleep problems |
| Medium | Mood-stabilising, antidepressant | Bipolar depression, add-on with depression |
| High | Antipsychotic (dopamine) | Schizophrenia, acute mania |
Never stop quetiapine abruptly
Never stop quetiapine from one day to the next and do not change the dose on your own. If the medicine is suddenly left out, discontinuation symptoms such as nausea, sleeplessness, inner restlessness and sweating can appear. The sleeplessness in particular can be temporarily stronger after stopping than before, which unsettles many. The dose should instead be reduced slowly and according to a medical plan over about two weeks or longer. Speak with your medical practice before you change anything, even if you feel better.
With quetiapine there are some interactions you should know. Grapefruit juice inhibits an enzyme in the liver that breaks down quetiapine, so that the active substance can work more strongly and longer, which is why the two should not be taken together. Even smaller amounts of grapefruit can trigger this effect. Alcohol as well as sleeping pills and painkillers intensify the dampening effect and can be dangerous. Other substances that lower the seizure threshold or influence the heart rhythm can also be problematic. Some antibiotics change the breakdown of quetiapine and can intensify its effect. So that your treatment stays safe, your medical practice and your pharmacy should always know which substances you take, including over-the-counter and herbal ones. An up-to-date medication plan that you bring to every appointment is very helpful for this.
Caution with grapefruit and dampening substances
Do not take quetiapine together with grapefruit juice, as this can intensify the effect. Be especially careful with alcohol and other dampening substances such as sleeping pills or painkillers, because the tiring effect can build up dangerously. In combination, strong drowsiness or a dangerously slowed breathing can occur. Always tell your medical practice and your pharmacy what else you take, so that interactions are recognised in time.
Quetiapine is usually taken in the evening, and exactly then a reliable reminder is helpful. brite helps you manage your medications, be reminded of the intake and get hints about possible interactions, for example with dampening substances. This way you keep your treatment safely under control in everyday life.
The bottom line is that quetiapine is an effective and versatile medicine whose effect changes strongly with the dose. Exactly this dose-dependence is the key to understanding the medicine and its effect correctly. Those who understand that a low dose mainly dampens and a high dose works antipsychotically can better classify the treatment. The use as a sleeping pill in a low dose is possible but without approval and not without risks, above all with regard to weight and metabolism. With depression, mood swings or lasting sleep problems, an open conversation about the best treatment is worthwhile, in which quetiapine is one option among several. Together with the practice it can be weighed up whether the benefit outweighs the possible side effects. What remains important: never stop on your own and keep an eye on weight and blood values. This way quetiapine can be used well and safely where it makes sense, and unnecessary risks are avoided.
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This article is for general information and does not replace medical advice, diagnosis or treatment. Never change the intake of quetiapine on your own and do not stop it without medical guidance. With strong or worrying side effects, contact your medical practice, in an emergency the emergency number.
