The British Journal of Psychiatry 128: 384-390 (1976)
© 1976 The Royal College of Psychiatrists
Plasma concentrations of protriptyline and clinical effects in depressed women
SF Whyte, AJ Macdonald, GJ Naylor and JP Moody
We studied the relationship between side effects, clinical outcome and the
drug plasma levels in 28 female depressed patients treated with
protriptyline. After 3 1/2 weeks treatment, patients with plasma levels
within a median range (630 to 900 nmol/l) showed better responses to the
drug than patients with plasma levels outside this range. There were no
statistically signficant correlations between plasma levels and side effect
scores or 'corrected' side effect scores (scores after subtracting
pretreatment values) for the group at any time after starting the
treatment. But we found positive correlations between plasma levels and
'corrected' side effect scores for the neurotic subgroup after 14 and 21
days of treatment. Other correlations between plasma levels and side effect
scores were non-significant.