Basic Pharmacology Flashcards
Who coined the term psychopharmacology?
Mach and Mora (1915)
How did the term psychopharmacology come about?
Studying opioid alkaloids on rat behaviour in a circular maze.
First antipsychotic found?
Plant Rauwolfia serpentine (1931) - Sen and Bose
When was Lithium found?
1949 (Cade)
When was the term neuroleptic coined?
1955 (Delay)
When was the first antidepressant discovered?
1952 - Iproniazid
When was the first benzo discovered?
Chlordiazepozide - 1954 (Sternbach)
When was Amitriptyline introcued?
1961
When was haloperidol found?
1958 - Janssen
When was risperidone found?
1989 - Janssen
Who made the first SSRI?
Carlssen
When was Fluxoetine trialled?
1970s
Remarketed in 1987
When was clozapine found?
1988 (Kane et al)
Which antipsychotics are aliphatic phenothiazines?
Chlorpromazine
Promazine
Triflupromazine
Which antipsychotics are piperidine derivatives?
Thioridazine
Which antipsychotics are piperazine derivatives?
Trifluoperazine
Fluphenazine
Perphenazine
Thioridazine
Which antipsychotics are Butyrophenones?
Haloperidol
Droperidol
Which antipsychotics are Thioxanthenes?
Thiothixene
Flupenthixol
Zuclopethixol
Which antipsychotics are Dihydroindoles?
Molindone
Which antipsychotics are Diphenylbutylpeperidine?
Primozide
Which antipsychotics are Dibenzodapine?
Loxapine
Chemical structure of Risperidone?
Benzisoxazole
Which antipsychotics are substituted benzamides?
Amisulpride
Sulpride
What is the chemical structure of clozapine?
Dibenzodiazepine
What is the chemical structure of Quetiapine?
Dibenzothiazepine
What is the chemical structure of Olanzapine?
Dibenzodiazepine
What is the chemical structure of Arpiprazole?
Arylpiperidylindole (quinolone)
Which antipsychotics are Benzisothiazole?
Ziprasidone
Which antidepressants are tertiary amines?
Imipramine Amitriptyline Clomipramine Dosulepin Trimipramine (Venlafaxine)
Importance of antidepressants which are secondary amines?
More potent
Less sedating
more noradrenergic
Less anthihistaminic or anticholinergic then tertiar
Which antidepressants are secondary amines?
Desipramine Amoxapine Notriptyline Protriptyline Duloxetine
Which antidepressants are hydrazine derivatives?
Phelzine
Which antidepressants are Aminoketone?
Bupropion
Chemical structure of zopiclone?
Cyclopyrrolone
Chemical structure of Trazadone?
Triazolopyridine
Is Sertraline an SSRI?
Yes
Name four SNRIs
Venlafaxine
Milnacipran
Duloxetine
Sibutramine
Classification of Duloxetine?
SNRI
E.g. of NARI
Reboxetine
E.g. of NDDI
Agomelatine
Two examples of NaSSA
Mirtazapine
Mianserin
Example of DARI
Bupropion
Example of RIMA
Moclobemide
Examples (2) of SARI
Nefazodone
Trazodone
What does RIMA stand for?
Reversible inhibitor of Monoamine A oxidase
What does DARI stand for?
Dopamine reuptake inhibitor
What does NaSSA stand for?
Noradrenergic and specific serotonergic antagonist
What does NDDI stand for?
Noradrenaline Dopamine Dis-inhibitor
Classification of Mirtazapine?
NaSSA
How does Xanomeline act?
Via M1/M4 agonism.
Initial features of Xanomeline with Alzheimers?
Improving cognitive function in Alzheimers and dose-dependent reductions in psychotic symptoms in Alzheimers.
Initial features of Xanomeline with Schizophrenia?
Efficacy in both positive and negative symptoms
Improvement in verbal learning and short term memory
Side effect of Xanomeline?
Gastrointestinal
How does Ketamine work?
NMDA receptor antagonist
Psychiatric use of Ketamine?
Rapid antidepressant effects in treatment-resistant depression
What is hygrophilicity?
When drugs exposed to moisture and light gain moisture, thereby reducing the availability of their active ingredient.
What is deliquescence?
Hygrophilicity to the degree that the drug will change to liquid if exposed to moist air.
E.g. of drug which has deliquescence
Sodium Valproate
What is an active placebo?
One that has some activity inherently, but not against the specific condition
Who coined the term placebo?
Beecher (1955)
What is it called when a placebo causes side effects?
Nocebo
What is placebo sag?
Decrease in placebo effect with repeated or chronic administration of placebo drugs
What is the efficacy paradox?
Where the placebo effect is disproportionately large for non-blinded therapies
Which diseases do placebos work best for?
Pain
Disorders of autonomic sensation
Disorders of factors under neurohumoral control e.g. nausea, BP, bronchial asthma
Which psych disorders show good response to placebo?
Depression
Anxiety
Phobias
Rate response to depression with placebo?
25-60%
Rate response to mania via placebo?
25%
Rate response to schizophrenia via placebo?
25-50%
Three factors needed for placebo action?
Nature of disease treated
Nature of dynamic relationship between pt and doctor
Patients expectations and experience with treatment in the past
What is the placebo run-in approach?
Where placebo reactors are eliminated prior to trial, which have been found to not lower placebo response rate.
Hypothesis of placebo analgesia?
Decreased beta-adrenergic activity of the heart
Which colour of tablets does anxiety respond best to?
Green
Which colour of tablets does depression respond best to?
Yellow
What is the natural remission theory?
Disorders for which placebo works are inherently episodic. Hence, even w/o treatment they would have eventually improved.
What is the measurement regression hypothesis?
When a continuous variable is measured repeatedly, with each subsequent measurement the mean will move from extreme values and come closer to the population mean.
What is the conditioning theory?
Placebo is a behavioural intervention. Patients who have learnt that receiving medications improves symptoms, will show a conditioned response of improvement with a placebo.
Difference between placebo and antidepressant in depression
Placebo: acts quickly, less likely to persist.
Antidepressant: acts later, more likely to persist.
What part of the brain is activated during placebo analgesia?
ACC - anatomical component of dopaminergic as well as opioid system
Phases of drug approval
Preclinical Animal Studies
Human trials - volunteers phase 1 (safety)
Human trials - patients phase 2 (effectiveness)
Human trials - patients phase 3 (comparative efficacy and tolerance)
Human trials - post-marketing surveillance phase 4
Regulatory agency for medications in UK
MHRA
What happens in preclinical animal studies?
Molecule is shown to have specific actions, on at least two different species.
Mutagenicity, carcinogenicity and organ system toxicity are studied.
What happens in phase 1 of drug trials?
Is drug safe for humans?
Given to humans; safety, tolerability and pharmacokinetics are studied.
What type of studies occur during phase 1?
Open or uncontrolled
What happens in phase 2 of drug trials?
Effectiveness studied in patients with disease compared to placebo.
Main methods in phase 2?
RCTs/controlled trials
What happens in phase 3 of drug trials?
Drug undergoes double-blind RCT to check how well it works and common SE.
What happens in phase 4 of drug trials?
Drug undergoes approval by regulatory bodies. Less common SE picked up when large scale prescribing occurs.
Post-marketing surveillance
Define compliance
To the extent to which a persons behaviour coincides with medical advice
Define adherence
Both clinician and patient are responsible for adherence.
Define concordance
Based on the notion that the therapeutic alliance between pt and dr is a negotiation process with equal respect to both parties.
Self-report adherence measurement tools?
Tablet Routine Questionnaire
Pill counts
Prescription monitoring
Saliva/plasma/urine tests
How to do a pill count?
Adherence (%) = (number of pills taken + number of pills prescribed) x 100
Non-adherence rate for antipsychotics?
40-60%
Non-adherence rate for mood stabilizers?
18-56%
Non-adherence rate for antidepressants?
30-97%
Factors that increase adherence
Family support Liquid/sublingual form High enthusiasm from clinician Good dr-pt relationship Continued access to clinician
Factors that reduce adherence
Asymmptomatic Cognitive deficits EtOH/substance misure Devaluation of medication by dr Fear of SE High frequency of daily doses Homelessness Chronic disease PO formulation Previous hx of non-adherence Polypharmacy Prophylactic/maintenance treatment Hostility/suspiciousness
Most common cause of non-adherence?
Lack of insight
Four main belief categories of the health belief model of adherence?
Benefits
Costs
Susceptibility
Secondary benefits of medication and adherence
Examples of psycho-education aimed at improving adherence
Cognitive-based
Behaviour-modification
Motivational interviewing
Compliance therapy
What does cognitive-based intervention do?
Targets patients attitudes and beliefs towards medication to influence their construction of the meaning of medication and illness
What does behaviour-modification intervention do?
Assume behaviour is learnt and can be modified. Patients are given instructions and strategies (reminds, reinforcements)
What does motivational interviewing do for medication adherence?
Allows patient to express personal reasons for and against adherence
What does compliance therapy do?
Based on motivational therapy and cognitive approaches.
Patients ambivalence towards medication is explored, following by discussion around consequences if medication were to stop.
Analogies with chronic physical illness are made, and pros and cons of medication considered.