Pharmacology 2.6 Flashcards
What is Calcitonin Gene-Related Peptide (CGRP)?
- potent vasodilator
- functions in the transmission of pain
What is the MOA of triptans?
- vasoconstriction of painful intracranial extra cerebral vessels
- inhibition of vasoactive neuropeptide
- inhibition of nococeptive NTs
How is the correct triptan chosen for each patient?
- fast vs. slow onset of activity
- formulation (oral, injection, nasal)
- formulatory tier and availability (sumatriptan = generic)
What are the pharmacokinetics of triptans?
- oral
- nasal
- subcutaneous (umatriptan)
- rapid onset of action*
What are the adverse effects of triptans?
- fatigue
- dizziness
- parasthesia
- warm sensation
- tightness (neck, chest, throat)
What are the contraindications of triptans?
- liver/kidney disorder
- MAO inhibitor therapy
- hemiplegic migraine
- basilar migraine
- hypersensitivity to triptans
- peripheral vascular disease
- uncontrolled blood pressure
What is the MOA of ergot alkaloids?
-DHE and ergotamine constrict cranial vascular bed
Which drug is best ofr intractable migraines?
DHE
Which drug is effective at the beginning of a migraine attack?
ergotamine
What are the pharmacokinetics of ergotamine?
- oral and suppository
- high first pass effect
- combined with caffeine helps bioavailability
- excreted by liver
What are the pharmacokinetics of DHE?
- SC, IV, IN, oral
- metabolized by liver
- excreted by feces
- metabolites similar to parent compound
- effects last longer than expected
What are the adverse effects of ergotamine?
- decreased blood flow to brain, heart, extremities
- diarrhea
- nausea
- vomitting
What are the contraindications of ergotamine?
- obstructive vascular disease
- collagen disease
- hypertension
- angina
- history of heart attack/silent ischemia
- liver/kidney disease
- serious infection
What is the MOA of propranolol?
- beta blocker
- MOA unknown
What is the first line drug for prevention of migraines?
propranolol