study guide 1 Flashcards
Which receptor causes mydriasis?
Alpha 1 receptors
Which receptor increases peripheral resistance (PR)?
Alpha 1 receptors
Which receptor causes closure of the urinary bladder?
Alpha 1 receptors
Which receptor modulates norepinephrine (NE) release?
Alpha 2 receptors
Which receptor moderates insulin release?
Alpha 2 receptors
Which receptor increases heart rate?
Beta 1 receptors
Which receptor increases AV node conduction?
Beta 2 receptors
Which receptor increases myocardial contraction?
Beta 1 receptors
Which receptor increases renin release?
Beta 1 receptors
Which receptor causes vasodilation?
Beta 2 receptors
Which receptor causes bronchial dilation?
Beta 2 receptors
Which receptor increases release of glucagon?
Beta 2 receptors
Which receptor causes relaxation of urinary bladder?
Beta 2 receptors
Which receptor decreases GI secretions?
Beta 2 receptors
Which receptor causes relaxation of uterine smooth muscle?
Beta 2 receptors
Dopamine is converted to ___.
Norepinephrine
Which receptor causes vasodilation?
Alpha 1 receptors
Drugs used to treat shock: (4)
- epinephrine
- norepinephrine
- dopamine
- metaraminol
The purpose of dopamine?
to treat shock from MI, trauma, open heart surgery
Physiological fx of dopamine:
- stimulates heart and BP
- causes renal dilation to increase blood flow to kidney
- prevents diminished blood flow to kidney
Side fx of dopamine:
- tachycardia
- angina/pain
- hypertension
- dyspnea
- N&V
- headaches
- arrythmias
Tx of benign prostatic hypertrophy (BPH) include:
Doxazosin
Terazosin
Tamsulosin
Difuzosin
Tx of BPH include drugs that target which SNS receptors?
Alpha 1 selective adrenergic blocking agent
Side fx of prazosin
- allergy to drug
- lactation
- hepatic impairment
- dizziness
- weakness
- N&V
- diarrhea
- arrythmia
- hypotension
- edema
- CHF
- angina/pain
- nasal congestion
- syncope (fainting)
Physiological reason for “1st dose syncope (fainting)”:
1st dose will cause a drop in BP which can cause syncope (fainting). Best for pt to take 1st dose at night.
Asthmatic pt should take what kind of beta blocker and why?
Beta 1 selective adrenergic blocking agent bc they usually don’t block beta1 receptor sites which is responsible for bronchodilation.
Propanolol is used for treating:
Hypertension, angina, migraines, anxiety
Propanolol side fx:
- allergic rxn
- bradycardia
- CHF
- cardiac arrythmia
- pulmonary edema
- gastric pain
- BRONCHOSPASM
Do not use propanolol if pt:
has asthma or is a smoker
Neurotransmitters of the SNS: (3)
Acetylcholine
NE
Ephinephrine
Beta blocker side fx:
- fatigue, dizziness, and sleep disturbances
- bradycardia, heart block, CHF, hypotension
- bronchoplasm, rhinitis
- N/V, diarrhea
- decreased libido
Phenylephrine used to tx:
- hypertension
- nasal decongestant
- shock
- tachycardia
- cold and allergies
Side fx of phenylephrine:
- anxiety
- restlessness
- depression
- fatigue
- blurred vision
- h/a
Do not ___ while on phenylephrine.
drink
Pregnancy category A
No risk to fetus in 1st trimester
No evidence for last trimesters
Pregnancy category B
No risk to animal fetus
No studies for pregnant women
Pregnancy Category C
Adverse fx in animals
No adequate studies in pregnant women
May be acceptable to use
Pregnancy category D
Human fetal risk
May be acceptable despite risk
Pregnancy category X
Clear damage to fetus
Risk outweighs any benefit
Therapeutic effect:
Amount of drug needed to cause an effect (beneficial)
Pharmacokinetics:
How the body acts on the drug Onset of drug action Movement of drug to body tissues Drug half-life Metabolism Site of excretion
Pharmacodynamics:
How the drug affects the body
Pharmacogenetics:
Study of genetically determined variations in response to drugs
First pass effect
Drugs given orally are directed to liver after absorption, where they may be largely inactivated by liver enzymes before they can enter general circulation
Critical concentration:
Amount of drug needed to cause a therapeutic effect.
Pharmacology:
Study of biological effects of a chemical
Synergistic fx:
2 drugs w/ diff mechanisms produce a greater effect than if given individually (1+1=3)
Metoprolol treats:
Hypertension, CHF, & MI
Additive fx:
2 drugs given in combo to produce a total effect the same as the sum of the indiv fx (1+1=2)
Antagonist fx:
2 drugs cancel each other out (1+1=0)
Cumulative fx:
Repeated admin of a drug may produce fx more pronounced than those produced by the first dose
Trade names:
Brand name given to a drug by the pharmaceutical co that dvlped it
Generic names:
Original designation that a drug is given when the drug co that dvlped it applies for the approval process