Amitriptyline vs Nortriptyline (Pamelor)
Both amitriptyline and nortriptyline are tricyclic antidepressants. Nortriptyline, a major metabolite of amitriptyline, is a secondary amine. It is less sedating and better tolerated than amitriptyline. But both have similar side effects, toxicities, and pharmacologic activity.
Amitriptyline and nortriptyline are FDA-approved for the treatment of depression. Amitriptyline has been better studied and its various off-label uses are better established.
Amitriptyline inhibits serotonin and noradrenaline uptake equally, whereas nortriptyline is a more potent inhibitor of noradrenaline than of serotonin uptake38. Nortriptyline has a longer half-life.
Nortriptyline is unique among the antidepressants in that its blood level exhibits the classical therapeutic window effect37. Blood concentrations above or below the therapeutic window (60-200 ng/ml) correlate with poor clinical response. Thus, therapeutic monitoring to ensure the drug level within the therapeutic window is critical for successful treatment with nortriptyline.
Both amitriptyline and nortriptyline have a similar analgesic action in postherpetic neuralgia34. Nortriptyline causes fewer side effects and may be better tolerated than amitriptyline.
Which antidepressant is more effective? Amitriptyline may be more effective in the treatment of endogenous depressive illness.
Nortriptyline was compared with amitriptyline in the treatment of 50 patients suffering from primary depression and classified as reactive and endogenous depressions35. All patients received promazine hydrochloride in addition to specific antidepressant. Comparison without diagnostic classification showed no significant difference in outcome between the two drugs, although amitriptyline was consistently more effective. The outcome of endogenous depressions treated with amitriptyline was significantly better than all other diagnostic groups. Reactive depressions on amitriptyline showed the least improvement but not significantly inferior to reactive and endogenous cases on nortriptyline, the latter two groups having almost identical outcomes.
Which antidepressant work faster? Nortriptyline provides more rapid antidepressant effect36.
In a double-blind trial37 after 1 week patients treated with nortriptyline had a significantly greater mean reduction in Hamilton depression score (55% compared to 25% for amitriptyline patients).
Amitriptyline vs Desipramine (Norpramin)
Desipramine appears to produce the greater reduction in pain intensity. Clinically meaningful pain relief (moderate or
better) is significantly more likely with desipramine than with amitriptyline 7.
Amitriptyline vs Capsaicin
Painful diabetic neuropathy
Topical capsaicin and oral amitriptyline produce equal and significant improvements in pain. However, topically
applied capsaicin is considerably safer alternative to amitriptyline for relief of the pain of diabetic neuropathy and,
unlike amitriptyline, is not associated with systemic side effects 8.
Amitriptyline vs Venlafaxine
Both have significant beneficial effect on pain parameters 10. Venlafaxine
prevents headaches in much the same way as the amitriptyline but with a much more tolerable side effect profile.
Venlafaxine may be preferred for migraine prophylaxis in patients involved in intense daily activities at work.
Both are effective in the treatment of depression. There are no significant differences in
Venlafaxine can improve social functioning more than amitriptyline. This effect may be linked to the higher rate of side
effects with amitriptyline 15.
Venlafaxine is associated with the lower rate of adverse effects than
amitriptyline 10, 14.
Amitriptyline vs Trazodone
Major depressive disorder
Amitriptyline and trazodone are both effective but not statistically different from each other in
terms of antidepressant action 2.
Amitriptyline is less effective than trazodone in the treatment of neurotic depression
18. Significant improvement may be noted with trazodone within the first
7 days of treatment.
Amitriptyline produces significantly higher weight gains than Trazodone 1.
Amitriptyline has the effects on the electrocardiograph and on systolic time intervals consistent with its proven
anticholinergic and quinidine-like properties. Trazodone, in contrast, has no quinidine-like effects
and minor effects on systolic time intervals 3.
Both produce impairments on memory tasks. However, the effect of amitriptyline is significantly greater and may reflect
its anticholinergic action over and above global sedative effects 16.
The study demonstrated that information processing, attention, and visual-motor skills are more adversely affected
by amitriptyline 17.
Amitriptyline vs Divalproate
Divalproate ER is more effective during first 3 months than amitriptyline in migraine33. However after 6 months, both are equally effective in migraine prophylaxis.
Hair fall, menstrual irregularity, polycystic ovary, and weight gain occur more frequently with Divalproate ER33.
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Published: March 31, 2008
Last updated: July 28, 2014