⚡ Quick Answer — What is Nasdep?
Nasdep bevat mirtazapine 30 mg from a WHO-GMP certified manufacturer (Lupin Pharmaceuticals) — a tetracyclic NaSSA antidepressant with a unique mechanism: alpha-2 adrenergic auto- and hetero-receptor antagonism boosts both noradrenaline and serotonin release while 5-HT2 / 5-HT3 antagonism redirects activated serotonin away from the receptors that cause SSRI side effects. Standard dose: 15–45 mg at bedtime (start 15 mg, target 30–45 mg). Strongly favoured when MDD presents with insomnia, low appetite, weight loss, or treatment-resistant agitated depression. Paradoxical sedation pattern: more sedating at low doses (15 mg) than at full dose (45 mg) because higher doses recruit more noradrenergic activity. Significant weight gain — the most of the antidepressants alongside paroxetine.
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What Is Nasdep?
Nasdep is an oral tablet of mirtazapine 30 mg manufactured by Lupin Pharmaceuticals. Mirtazapine (US brand Remeron) is a tetracyclic noradrenergic and specific serotonergic antidepressant (NaSSA) launched by Organon in 1994. Its mechanism is unlike any other antidepressant in routine use: rather than blocking reuptake, it antagonises pre-synaptic alpha-2 adrenergic receptors on noradrenergic neurons (boosting noradrenaline release) and on serotonergic nerve terminals (hetero-receptor effect, boosting serotonin release), while simultaneously antagonising 5-HT2A, 5-HT2C, and 5-HT3 receptors. The 5-HT2 and 5-HT3 blockade redirects the augmented serotonin away from the receptors responsible for SSRI side effects (sexual dysfunction, anxiety, GI upset).
It is a strong H1 antihistamine, which drives sedation and appetite stimulation.
Goedgekeurde indicaties
- Major depressive disorder (MDD) — particularly when insomnia, low appetite, weight loss, or agitation are prominent
- Off-label: anxiety disorders (GAD, social anxiety, PTSD), chronic insomnia (low dose 7.5–15 mg), refractory itch, chronic nausea, anorexia/cachexia, hot flashes
- Treatment-resistant depression: combined with venlafaxine (“California rocket fuel”) under specialist supervision
Dosering
| Indicatie | Start | Streefdosering | Maximum | Opmerkingen |
|---|---|---|---|---|
| MDD | 15 mg at bedtime × 1 week | 30–45 mg at bedtime | 45 mg/day | Higher doses recruit more noradrenergic activity — paradoxically less sedating |
| Off-label insomnia | 7.5–15 mg at bedtime | 7.5–15 mg at bedtime | — | Limit to short-term; weight gain is real even at low dose |
| Ouderen | 7.5–15 mg at bedtime | 15–30 mg at bedtime | 30 mg/day | Reduce starting dose; greater orthostasis and sedation |
| Lever-/nierfunctiestoornis | 15 mg at bedtime | Up to 30 mg/day | — | Reduced clearance — slower up-titration |
Bijwerkingen
Side-effect profile by mechanism
| Mechanism | Effects | Opmerkingen |
|---|---|---|
| H1 blockade | Sedation, weight gain (appetite stimulation) | Weight gain is significant — commonly 4–7 kg in 6 months. Sedation paradoxically reduces at higher doses |
| Alpha-1 blockade | Orthostatische hypotensie, duizeligheid | Particularly in elderly — check lying / standing BP |
| Anticholinergic (mild) | Droge mond | Less than TCAs |
| 5-HT3 antagonism | Anti-emetic; reduced GI upset | Why mirtazapine causes much less nausea than SSRIs / SNRIs |
| Anders | Increased cholesterol, triglycerides, glucose | Metabolic monitoring useful at 6–12 months |
| Zeldzaam | Agranulocytosis (1/1000) | Stop and check FBC if persistent fever, sore throat, mucosal ulceration in first 6 weeks |
| Zeldzaam | Hyponatraemia (SIADH) | Older adults at greatest risk |
| Zeldzaam | Restless legs, vivid dreams | Patient counselling |
The Mirtazapine Sedation Paradox
Many patients are confused that mirtazapine 15 mg is more sedating than mirtazapine 30–45 mg. This is real and well-described pharmacologically: at low doses, H1 blockade dominates (sedating). At higher doses, the noradrenergic boost from alpha-2 antagonism is more activating, partly offsetting the antihistamine sedation. So patients started at 15 mg who feel too groggy can sometimes be helped by going up to 30 mg, not down. This is counterintuitive and worth explaining when prescribing.
Geneesmiddelinteracties
Absolute contra-indicatie: MAOIs (14-day washout). Serotonin syndrome risk is lower than for SSRIs because mirtazapine does not increase synaptic serotonin via reuptake inhibition, but the warning still stands.
Additive CNS depression: alcohol, benzodiazepines, opioids, sedating antihistamines, sleep medications.
CYP2D6 / CYP3A4 substrate: levels rise with strong inhibitors; combination with paroxetine, fluoxetine, ketoconazole, ritonavir requires care.
Veelgestelde vragen
How long does Nasdep take to work?
Sleep and appetite often improve within 1–2 weeks. Full mood response in MDD typically appears at 4–6 weeks. Many prescribers consider mirtazapine for patients with insomnia and weight loss because the favourable side effects work for them rather than against them.
Why does Nasdep cause weight gain?
Mirtazapine is a strong H1 antihistamine and 5-HT2C antagonist — both stimulate appetite. Weight gain is dose-independent and often substantial (4–7 kg in 6 months). For patients with depression-related weight loss this is therapeutic; for others it is the main reason to switch.
Can I take Nasdep for sleep without depression?
It is sometimes used at low dose (7.5–15 mg) for chronic insomnia in patients where other sleep medications have failed. It is not first-line because the weight gain and sedation persist long-term.
Why does the dose paradox happen?
At 15 mg, H1 blockade (sedating) dominates. At 30–45 mg, the noradrenergic boost from alpha-2 antagonism is more activating — partly offsetting the antihistamine sedation. Patients can sometimes resolve groggy 15 mg by going up to 30 mg.
Does Nasdep cause sexual side effects?
Much less than SSRIs — the 5-HT2 antagonism redirects serotonin away from the receptors responsible for SSRI sexual dysfunction. Mirtazapine is sometimes added to or substituted for SSRIs specifically to relieve sexual side effects.
Can Nasdep be combined with venlafaxine?
Yes — the venlafaxine + mirtazapine combination is informally called “California rocket fuel” and is one of the most-evidenced strategies for treatment-resistant depression. Done under specialist supervision.
Is Nasdep safe in pregnancy?
Limited safety data — not first-line. SSRIs (sertraline preferred) have larger registry data. Discuss individually with the prescriber.
Wat gebeurt er als ik een dosis mis?
Take it as soon as you remember unless close to the next dose — never double up. Mirtazapine has a long half-life (20–40 h), so a single missed dose rarely matters.
How should Nasdep be stopped?
Mirtazapine has a milder discontinuation syndrome than SSRIs/SNRIs. Taper by 15 mg every 2–4 weeks. Sleep and appetite changes may rebound — expect this.
How should Nasdep be stored?
Store at 15–30 °C in the original blister packaging away from moisture and sunlight. Keep out of reach of children.
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