Applies to mirtazapine: oral tablet, oral tablet disintegrating. Along with its needed effects, mirtazapine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Circadian rhythm ( biological clock ) disorders are a common cause of drowsiness as are a number of other conditions such as sleep apnea, insomnia, and narcolepsy. The body clock disorders are classified as extrinsic (externally caused) or intrinsic. Remeron (mirtazapine) is a tetracyclic antidepressant used to treat depression. Remeron is available in generic form (mirtazapine). Remeron has been used to treat nausea, anxiety, post traumatic stress syndrome, and used as an appetite stimulant. Mirtazapine is a white to creamy white crystalline powder which is slightly soluble in water. REMERON is supplied for oral administration as scored film-coated tablets containing 15 or 30 mg of mirtazapine, and unscored film-coated tablets containing 45 mg of mirtazapine. Sexual side effects are common with antidepressants in both men and women, but there are options to prevent or reduce such side effects. Abrupt discontinuation of mirtazapine should be avoided when possible. Adverse effects have been reported upon discontinuation of the drug including nausea, vomiting, agitation, sensory disturbances, sweating, and headache. The most common cause of hyperthyroidism is a tumour known as an adenoma, which is usually benign (i.e. the tumour is not cancerous). Mirtazapine Orally Disintegrating Tablets are an orally administered drug. Mirtazapine has a tetracyclic chemical structure and belongs to the piperazino-azepine group of compounds. The MARC concluded that the available data supports an association between the use of tricyclic antidepressants, selective serotonin reuptake inhibitors, maprotiline, mianserin, moclobemide, mirtazapine and venlafaxine and the development of QT prolongation. Talk to your doctor or mental health provider about any side effects you're having. For some antidepressants, monitoring blood levels may help determine the range of effectiveness and to what extent dosage can be adjusted to help reduce side effects.