MIDTERM 01 - CNS Depressants and Antiseizure Drugs Flashcards
Are drugs that can be used to slow down or “depress” the functions of the CNS
CNS depressants
CNS depressants often share at least one MOA: positive modulation of the action of γ-aminobutyric acid (GABA) at __________
GABA A receptor complex
Drugs that reduce anxiety and exert a calming effect
Sedatives/Anxiolytics
Drugs that produce drowsiness and encourage the onset and maintenance of a state of sleep; involve a more pronounced depression of the CNS than sedation
Hypnotics
A major inhibitor neurotransmitter in the brain; deficiency of its activity in the CNS is important in the pathophysiology of anxiety and insomnia
Gamma-aminobutyric acid (GABA)
2 types of receptors activated by GABA (IM)
Ionotropic receptors (GABA A and GABA C), Metabotropic receptor (GABA B)
GABA receptor that is the target for many anxiolytics and sedative-hypnotic agents
GABA-A receptor
GABA A receptor agonist (Drug example)
Benzodiazepines
GABA A receptor inverse agonist (Drug example)
β-carbolines
GABA A receptor antagonist (Drug example)
Flumazenil
A GABA A receptor agonist; increases the frequency of opening of the chloride channel
Benzodiazepines
A GABA A receptor inverse agonist; increases anxiety, produces panic attacks, and improves memory
β-carbolines
A GABA-A receptor antagonist drug; used clinically to counteract the sedative effect of benzodiazepine overdose
Flumazenil
___________ is required for the activity (SAR of benzodiazepines)
Aromatic/Heteroaromatic ring A
An __________ has a higher activity than a heteroaromatic ring (SAR of benzodiazepines)
Aromatic ring
An electronegative substituent at position ___________ is required for activity (SAR of benzodiazepines)
7
The more electronegative the atoms are, the __________ the activity (SAR of benzodiazepines)
Higher
Positions __________, ___________, and __________ should NOT be substituted with an electronegative substituent (SAR of benzodiazepines)
6, 8, 9
A phenyl ring C at position __________ promotes activity (SAR of benzodiazepines)
5
If a benzodiazepine is ____________ or __________ substituted with electron withdrawing group, it increases activity (SAR of benzodiazepines)
Ortho (2) or diortho (2,6)
A __________ substitution of a benzodiazepine decreases activity (SAR of benzodiazepines)
Para
A benzodiazepine __________ a 3-OH group ↓ DOA (short-acting) (SAR of benzodiazepines)
With
A benzodiazepine __________ a 3-OH group ↑ DOA (long-acting)
Without
A proton-accepting group at __________ is required (SAR of benzodiazepines)
C2
A 2-__________ group is important for activity (SAR of benzodiazepines)
Carbonyl (C=O)
A nitrogen atom at position __________ is important for activity (SAR of benzodiazepines)
1
A 1,2 fused __________ or __________ ring increases activity and is short acting (SAR of benzodiazepines) (TI)
Triazole, Imidazole
Triazolam, midazolam (DOA of benzodiazepines)
Short acting
Alprazolam, estazolam, lorazepam, temazepam, oxazepam (DOA of benzodiazepines)
Intermediate acting
Chlorazepate, chlordiazepoxide, clonazepam, diazepam, flurazepam, quazepam (DOA of benzodiazepines)
Long acting
An imidazopyridine; a short acting hypnotic (Examples of nonbenzodiazepine BzRAs)
Zolpidem
A cyclopyrrolone that is a moderate-acting hypnotic (Examples of nonbenzodiazepine BzRAs)
Eszopiclone
Racemic mixture that contains eszopiclone
Zopiclone
Isomer of zopiclone that is the primary active hypnotic
S-isomer
A pyrazolopyrimidine; a short-acting hypnotic (Examples of nonbenzodiazepine BzRAs)
Zaleplon
A hormone that plays a role in the circadian rhythm of humans; is a poor hypnotic drug
Melatonin
Melatonin is a hormone that is the N-acetylated and O-methylated product of __________ found in the pineal gland
Serotonin
Drug derived from melatonin; activate melatonin receptors; more efficacious than melatonin but less efficacious than benzodiazepines as a hypnotic
Ramelteon
Drugs that are 5,5-disubstituted barbituric acids; increase the duration of the GABA-gated chloride channel openings
Barbiturates
The __________ is 2,4,6,-trioxohexahydropyrimidine, which lacks CNS depressant activity (SAR of barbiturates)
Barbituric acid
Replacement of both hydrogens at position __________ with alkyl or aryl groups confers (gives) the activity (SAR of barbiturates)
5
In general, increasing __________ increases hypnotic potency, faster onset of action, and shorter duration of action (SAR of barbiturates)
Lipophilicity
Increasing number of carbon atoms at the __________ position increases lipophilicity (SAR of barbiturates)
R5
__________ increase the lipid solubility of the barbituric acid derivatives (SAR of barbiturates)
Unsaturation
Addition of alkyl group at __________ increases lipophilicity; leads to quicker onset and shorter duration of action (SAR of barbiturates)
R1
Replacement of oxygen by sulfur at position __________ in thiobarbiturates increases lipophilicity (SAR of barbiturates)
2
Barbiturates that are ultra-short acting; they are used as anesthetic, not as sedative-hypnotics (SAR of barbiturates)
Thiobarbiturates
Thiopental, thiamylal (DOA of barbiturates)
Ultra-short acting
Pentobarbital and secobarbital (DOA of barbiturates)
Short acting
Amobarbital, butabarbital (DOA of barbiturates)
Intermediate acting
Mephobarbital, phenobarbital (DOA of barbiturates)
Long acting
Structurally similar to the barbiturates, especially phenobarbital (Amidines and imides - miscellaneous sedative-hypnotics)
Glutethimide
CNS depressant potency increases up to __________ carbon atoms, with activity decreasing thereafter (SAR of alcohols and their carbamate derivatives)
8
Branching of the alkyl chain __________ depressant activity (SAR of alcohols and their carbamate derivatives)
Increases
Order of potency (SAR of alcohols and their carbamate derivatives)
Tertiary > secondary > primary
Replacement of a hydrogen atom in the alkyl group by a halogen __________ potency (SAR of alcohols and their carbamate derivatives)
Increases
Carbamylation of alcohols generally __________ depressant potency (SAR of alcohols and their carbamate derivatives)
Increases
A mild sedative-hypnotic with a quick onset and short duration of action (Alcohols and their carbamate derivatives - miscellaneous sedative-hypnotics)
Ethchlorvynol
Officially indicated as an anxiety agent; also a sedative-hypnotic agent and a centrally acting skeletal muscle relaxant (Alcohols and their carbamate derivatives - miscellaneous sedative-hypnotics)
Meprobamate
A mono-N-isopropyl-substituted relative of meprobamate; indicated in acute skeletomuscular conditions (Alcohols and their carbamate derivatives - miscellaneous sedative-hypnotics)
Carisoprodol
The p-chloro substituted and 1-carbamate derivative of mephenesin (Alcohols and their carbamate derivatives - miscellaneous sedative-hypnotics)
Chlorphenesin carbamate
More sustained in effect that mephenesin; the dihydric parent compound, guaifenesin, is used as an expectorant (Alcohols and their carbamate derivatives - miscellaneous sedative-hypnotics)
Methocarbamol
The dihydric parent compound of methocarbamol used as an expectorant
Guaifenesin
Used as a sedative in nonoperating room procedures for the pediatric patient (Aldehydes and their derivatives - miscellaneous sedative-hypnotics)
Chloral hydrate
Chloral hydrate is thought to act principally through a metabolite, __________
Trichloroethanol
Refers to a combination of ethanol and chloral hydrate
Mickey Finn
A cyclic trimer of acetaldehyde (Aldehydes and their derivatives - miscellaneous sedative-hypnotics)
Paraldehyde
Are symptoms of disturbed electrical activity in the brain that cause involuntary movement, sensation, or thought
Seizures
Phenobarbital and primidone are examples of __________ (Antiseizure drugs)
Barbiturates
A derivative of phenobarbital (Antiseizure drugs - barbiturates)
Primidone
Phenytoin and fosphenytoin are examples of __________ (Antiseizure drugs)
Hydantoins
Also known as 5,5-diphenylhydrantoin (Antiseizure drugs - hydantoins)
Phenytoin
The prodrug of phenytoin (Antiseizure drugs - hydantoins)
Fosphenytoin
Trimethadione and dimethadione are examples of __________ (Antiseizure drugs)
Oxazolidinediones
Ethosuximide and methsuximide are examples of __________ (Antiseizure drugs)
Succinimides
Diazepam and clonazepam are examples of __________ (Antiseizure drugs)
Benzodiazepines
Carbamazepine and oxcarbazepine are examples of __________ (Antiseizure drugs)
Iminostilbene (Dibenzazepine) derivates
Gabapentin, pregabalin, and vigabatrin are examples of __________ (Antiseizure drugs)
GABA analogues
A broad spectrum anticonvulsant (Antiseizure drugs - GABA analogues)
Valproid acid
A bis-carbamate (Antiseizure drugs)
Felbamate
Drug from the phenyltriazine class (Antiseizure drugs)
Lamotrigine
A sulfonamide-type anticonvulsant (Antiseizure drugs)
Zonisamide
A pyrrolidone derivate; an analog of the nootropic agent, piracetam (Antiseizure drugs)
Levetiracetam
Levetiracetam is an analog of the nootropic agent, __________
Piracetam
Contains nipecotic acid as the active moiety (Antiseizure drugs)
Tiagabine