Treatment - Pharmacotherapy Overview

Revision as of 14:55, 5 August 2022 by Rishabaiims (talk | contribs)

Pharmacotherapy consists of the decision to start an agent or to refrain for the time being. While important to consider adding a medication, it is equally as important to consider reducing medication that is either ineffective or potentially causing adverse effects.


Antidepressants

a. SSRIs – generally equivalent in efficacy
• paroxetine is avoided due to anticholinergic burden and medication interactions
• fluoxetine is helpful to avoid withdrawal in patients with nonadherence due to its long half-life
• fluvoxamine has been studied to be effective in patients with OCD
citalopram is known to be associated with QTc prolongation


b. SNRIs – if SSRI trials are failed, may consider SNRI. If there is an element of chronic pain, consider duloxetine
c. DNRI (bupropion) – good to consider if there is an element of inattention / fatigue due to the dopaminergic quality, avoid in patients with seizure disorders
d. TCAs – this category has greater anticholinergic burden, though nortriptyline and amitriptyline may be helpful in patients with chronic headaches; clomipramine has been studied to be effective in patients with OCD
e. MAOIs – generally avoided due to diet restrictions and medication interactions

Anxiolytics

a. SSRIs and SNRIs – as above
b. Buspirone – low side-effect profile, can be taken three times a day
c. Benzodiazepines – helpful in short-term treatment of anxiety, but generally should be tapered off due to dyscognitive side-effects, increased fall risk, and generally ineffective for long-term use
d. Antiadrenergics – may be a good option for anxiety and agitation in TBI patients, caution in patients with lower blood pressure or bradycardia
• Beta-blockers – propranolol can be used TID and eventually consolidated into once a day long-acting medication
• Clonidine
• Prazosin – helpful to treat PTSD associated nightmares

Mood stabilizers

a. Lamotrigine – slow titration to avoid Steven Johnson Syndrome, though beneficial for bipolar depression
b. Lithium – beneficial for both control of mania and depression in bipolar disorder, though many side effects (weight gain, polydipsia/polyuria, thyroid dysfunction), requires blood serum monitoring
c. Valproic acid – beneficial for control of mania or in agitation; not helpful for depression, should be avoided in women of childbearing age
d. Carbamazepine – beneficial for control of mania; not helpful for depression, many medication interactions, should not be given to women of childbearing age
e. Antipsychotics – have mood stabilizing properties

Antipsychotics

a. First generation – acts on dopamine
b. Second generation – acts on dopamine and serotonin
• Quetiapine favored by neurologists due to low dopaminergic component, however, to reach dopaminergic effects and benefit antipsychotic properties, typically doses of 400mg+ is required. It has not been shown to be effective in controlling psychosis in Parkinson disease or agitation in dementia. Also beneficial for bipolar depression
• Clozapine is more effective in controlling psychotic symptoms though it requires weekly blood draws to monitor for possible blood dyscrasia; it also has the worst side-effect profile regarding weight gain and metabolic effects.
• Pimavanserin – no dopaminergic qualities, has been approved for treatment of Parkinson's disease psychosis
• Lurasidone - shown to be beneficial for bipolar depression
• Aripiprazole – partial agonist; shown to be beneficial as a potential augmenting agent for depressive disorder, long half-life