The certainty of evidence was rated as very low, and no data were available for longer-term treatment (3 months). For comparison, the other sedating antihistamines assessed, doxepin and doxylamine, had effect sizes (SMD) at 4 weeks of 0.30 (95% CI –0.05 to 0.64) (very low certainty evidence) and 0.47 (95% CI 0.06 to 0.89) (moderate certainty evidence), respectively.The effective dosage of trimipramine in depression is 150 to 300 mg/day. Doses of trimipramine used for insomnia range from 25 to 200 mg/day. However, it has been advised that doses be kept as low as possible, and a low dose of 25 mg/day has been recommended. Contraindications
Contraindications include:
Recent myocardial infarction
Any degree of heart block or other cardiac arrhythmias
Mania
Severe liver disease
During breastfeeding
Hypersensitivity to trimipramine or to any of the excipients

Side effects
The side effects of trimipramine have been said to be similar to those of other tertiary amine TCAs, with a preponderance of anticholinergic and sedative effects. However, trimipramine has also been said to be associated with a different side effect profile compared to other TCAs and in general with fewer side effects, chiefly due to its lack of norepinephrine reuptake inhibition and relatively lower anticholinergic effects (although it is still a potent anticholinergic). Somnolence is the most common side effect of the drug.
It was patented in 1959 and first appeared in the literature in 1961. The drug was first introduced for medical use in 1966, in Europe. It was not introduced in the United States until later in 1979 or 1980. Society and culture
Generic names
Trimipramine is the generic name of the drug and its INN, USAN, BAN, and DCF, while trimipramine maleate is its USAN, USP, BANM, and JAN. Its generic name in Latin is trimipraminum, in German is trimipramin, and in Spanish is trimipramina. Brand names
Trimipramine is marketed throughout the world mainly under the brand name Surmontil. Other notable brand names of trimipramine have included Herphonal, Rhotrimine, Sapilent, Stangyl, and Tydamine. Availability
Trimipramine is no longer marketed in Australia, though it was previously. == References ==