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Mirtazapine is a prescription antidepressant introduced by Organon International in 1996. It is marketed under the tradenames Remeron in the U.S. and Finland, Avanza in Australia, Zispin in the UK & Ireland, Norset in France, Remergil in Germany and Mirtabene in Austria). It is used primarily for the treatment of clinical depression in adults. It has a tetracyclic chemical structure and is a white to creamy white crystalline powder, distributed in tablets of 15mg, 30mg, and 45mg.

Mirtazapine is chemically unrelated to other antidepressants. It is thought to work by blocking presynaptic alpha-2 adrenergic receptors that normally inhibit the release of the neurotransmitters norepinephrine and serotonin, thereby increasing active levels in the synapse. Mirtazapine also blocks post-synaptic 5-HT2 and 5-HT3 receptorsan action which is thought to enhance serotonergic neurotransmission while causing a low incidence of side effects.
Mirtazapine Drug

Side effects
The side effects that do occur are thought to be primarily related to the blockage of histamine receptors, which decreases with higher dosages. These side effects may include:

Drowsiness, especially at lower doses
Increased weight and appetite
Dry mouth
Upset stomach
Vivid, unusual, and often times frightening dreams or nightmares
Restless Legs Syndrome
Interestingly, its side effect profile can be used for benefit in certain clinical situations. The drowsiness, increased appetite, and weight gain it causes are useful in patients with depressive disorders with prominent sleep and appetite disturbances. In addition, it is quite useful in inpatient situations in which patients suffer from nausea since it also antagonizes the 5-HT3 receptor, the target of the popular anti-emetic ondansetron (Zofran).

Other useful drug information: Dilantin | Avalide | Bupropion | Toprol | Tylenol | Aciphex | Aricept

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