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Paroxetine is a selective serotonin reuptake inhibitor (SSRI) used for depression as well as anxiety and panic disorders. It works reliably, but it has a short half-life and no active metabolite — which is why discontinuation symptoms are more common and more pronounced here than with any other SSRI. With paroxetine, a slow, medically supervised taper is not optional.
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Paroxetine is the strongest CYP2D6 inhibitor among the SSRIs. CYP2D6 is a liver enzyme that breaks down many medicines or — in the case of tamoxifen — first converts them into their active form. Anyone taking paroxetine therefore alters the levels of a number of other drugs. On top of that come the serotonin and bleeding issues shared by the whole SSRI group.
| Combination | Consequence | What to do |
|---|---|---|
| MAO inhibitors (e.g. tranylcypromine, moclobemide) | Life-threatening serotonin syndrome | The combination is contraindicated; the necessary gaps in both directions are set by the practice |
| Tamoxifen (breast cancer treatment) | Paroxetine blocks the conversion into the active form — the protective effect of the treatment can fall | Have this combination checked medically without fail; often another antidepressant is chosen |
| Metoprolol and other beta blockers metabolised by CYP2D6 | Levels rise — a slow pulse, a drop in blood pressure and dizziness are possible | Declare the combination; keep an eye on pulse and blood pressure, and the practice may adjust the dose |
| Tramadol | The risk of serotonin syndrome rises; at the same time paroxetine weakens the pain relief, because tramadol is activated via CYP2D6 | Only after medical assessment; talk about alternatives |
| NSAIDs such as ibuprofen, aspirin, blood thinners | Clearly increased risk of gastrointestinal bleeding | Do not add painkillers on your own initiative; clarify the need and stomach protection with your practice or pharmacy |
| Triptans such as sumatriptan | Serotonin syndrome possible, if rare | Agree the combination with your doctor; know the warning signs |
| St John's wort | Serotonin syndrome possible | Herbal does not mean harmless — avoid the combination or declare it |
| Alcohol | Increased tiredness and slower reactions; alcohol worsens depression | Be cautious, especially at the start of treatment |
The single most important case is tamoxifen: it is what is known as a prodrug — only CYP2D6 turns it into the actual active substance. A strong inhibitor such as paroxetine can slow that activation down and so reduce the protective effect of breast cancer treatment. If both are prescribed to you, raise the combination actively. For everyone else the rule is: show your full medication list and have new prescriptions checked — in the guide to drug interactions or directly in the interaction check in the brite app. On the subject of alcohol, the guide medications and alcohol is worth reading.
All SSRIs are considered comparably effective according to the guideline — the choice is made on the side effect profile, interactions and kinetics.² And in exactly these three respects, paroxetine sits at the edges of the group.
| Active ingredient | Half-life | Character in everyday use |
|---|---|---|
| Paroxetine | approx. 1 day, no active metabolite | Tends to be sedating, anticholinergic effects, more weight gain; the strongest discontinuation symptoms and the strongest CYP2D6 inhibitor in the group |
| Sertraline | approx. 1 day | Fairly neutral, little CYP inhibition, well studied in heart disease — often the pragmatic first choice |
| Citalopram / escitalopram | approx. 1.5 days | Few interactions via liver enzymes, but clear QT-related dose limits |
| Fluoxetine | 4–6 days plus an active metabolite | Activating; the mildest discontinuation symptoms in the group — the counterpart to paroxetine, but with waits of weeks when switching |
To be fair: paroxetine is not a "bad" SSRI. Its sedating component can be exactly right when anxiety is pronounced, and anyone who is stable on it has no reason to switch. Switches within the group or to other substances such as venlafaxine or mirtazapine are decided by the treating practice.
Breastfeeding: here the assessment is friendlier — paroxetine passes into breast milk only in small amounts and is, according to Embryotox, among the SSRIs that can be used while breastfeeding. This weighing-up, too, is made by the practice case by case.⁴
Older age: the anticholinergic effects weigh more heavily in older people: dry mouth, constipation, confusion and a higher risk of falls through drowsiness. On top of that come the hyponatraemia and bleeding risks of the SSRI group. If you take several medicines at once, it is worth looking at medications in old age and polypharmacy.
Driving and machinery: particularly while the dose is being settled and after dose changes, paroxetine can make you tired and slower. Plan journeys defensively in the first few days and read the ground rules under medications and driving.
Most probably these are discontinuation symptoms, not an infection. Because of the short half-life, the paroxetine level already drops markedly after one or two missed days — dizziness, aching limbs, chills and irritability are the typical price. Take that with you to your practice as important information: it shows how sensitively your body reacts to swings in the drug level — and the tapering plan will later be based on exactly that. In the short term, returning to regular dosing helps.
Paroxetine is not addictive in the sense of a dependency — it creates no craving, no need for higher doses, no loss of control. What you are experiencing is a physical adaptation: the brain has adjusted to the substance and protests when it disappears too fast. The difference matters, because the solution is a different one: not withdrawal treatment, but a sufficiently slow, medically supervised exit. With enough time, the vast majority of people come off paroxetine well.
Weight gain is more common with paroxetine than with most other SSRIs. A slowed metabolism, more appetite for carbohydrates and the anticholinergic component are all discussed as reasons. It helps to record your weight from the start of treatment — then you can counteract early or talk about alternatives. Important: do not quietly leave the medicine out because of it; that trades one solvable problem for two.
The honest answer: considerably longer than most people expect — weeks to months, depending on the dose, how long you have taken it and how sensitive you are. The reduction steps get smaller towards the end, because the level falls disproportionately thanks to the non-linear kinetics; for the last few milligrams, divisible tablets or the oral suspension are often used. A slow plan is not a detour: people who reduce too fast and develop symptoms often have to start again higher up.
Not on your own initiative. The SmPC describes taking it in the morning with breakfast, but the practice can adjust the timing individually if the tiredness interferes with everyday life. Do not switch the time back and forth yourself — with a short half-life that shifts the level curve noticeably. Often the tiredness eases after the first few weeks anyway.
The interaction check shows critical combinations before you take them.
