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Questions and Answers
Which character is NOT associated with drug dependence?
Which character is NOT associated with drug dependence?
What is a method of abusing addicting drugs that does NOT involve smoking or inhalation?
What is a method of abusing addicting drugs that does NOT involve smoking or inhalation?
Which type of addict primarily uses drugs for therapeutic purposes?
Which type of addict primarily uses drugs for therapeutic purposes?
What is meant by 'cellular adaptation' in the context of drug dependence?
What is meant by 'cellular adaptation' in the context of drug dependence?
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Which of the following symptoms typically indicates withdrawal from a drug?
Which of the following symptoms typically indicates withdrawal from a drug?
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What is the primary mechanism of action of digitalis at therapeutic doses?
What is the primary mechanism of action of digitalis at therapeutic doses?
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Which symptom is most commonly associated with digitalis toxicity?
Which symptom is most commonly associated with digitalis toxicity?
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What effect does digitalis have on potassium levels in acute toxicity?
What effect does digitalis have on potassium levels in acute toxicity?
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Which of the following is NOT an effect of digitalis at toxic doses?
Which of the following is NOT an effect of digitalis at toxic doses?
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Which plant is a source of digitalis?
Which plant is a source of digitalis?
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What is the first clinical manifestation of digitalis toxicity often seen?
What is the first clinical manifestation of digitalis toxicity often seen?
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In chronic digitalis toxicity, what is usually the status of serum potassium levels?
In chronic digitalis toxicity, what is usually the status of serum potassium levels?
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How can the need for antidotal therapy in digitalis toxicity be predicted?
How can the need for antidotal therapy in digitalis toxicity be predicted?
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What is the recommended dose of Digibind based on a total body load of digoxin?
What is the recommended dose of Digibind based on a total body load of digoxin?
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Which of the following is NOT a treatment option for digoxin toxicity?
Which of the following is NOT a treatment option for digoxin toxicity?
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What is the serious prognosis threshold for digoxin levels in ng/ml?
What is the serious prognosis threshold for digoxin levels in ng/ml?
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Which form of cannabis contains dried resin from the flower tops?
Which form of cannabis contains dried resin from the flower tops?
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What is a common method for treating bradycardia associated with digoxin toxicity?
What is a common method for treating bradycardia associated with digoxin toxicity?
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Which of the following indicates the administration of Digibind?
Which of the following indicates the administration of Digibind?
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What is the primary ingredient in hashish oil?
What is the primary ingredient in hashish oil?
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Which electrolyte disturbance is treated with potassium chloride?
Which electrolyte disturbance is treated with potassium chloride?
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What is the primary psychoactive component found in Cannabis Sativa?
What is the primary psychoactive component found in Cannabis Sativa?
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Which of the following routes of administration for cannabis has the fastest absorption?
Which of the following routes of administration for cannabis has the fastest absorption?
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What condition is NOT typically associated with cannabis poisoning?
What condition is NOT typically associated with cannabis poisoning?
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Which of the following best describes the metabolism of THC?
Which of the following best describes the metabolism of THC?
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What effect does THC have on the sympathetic and parasympathetic nervous systems?
What effect does THC have on the sympathetic and parasympathetic nervous systems?
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Which physiological response is commonly associated with cannabis use?
Which physiological response is commonly associated with cannabis use?
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What is the consequence of an overdose of cannabis?
What is the consequence of an overdose of cannabis?
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Which of the following statements about the clinical presentation of THC is incorrect?
Which of the following statements about the clinical presentation of THC is incorrect?
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What is a prominent characteristic of LSD's effect on perception?
What is a prominent characteristic of LSD's effect on perception?
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Which mechanism is primarily associated with LSD's action?
Which mechanism is primarily associated with LSD's action?
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Which symptom is least likely associated with LSD intoxication?
Which symptom is least likely associated with LSD intoxication?
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What form of management is recommended for someone under the influence of LSD?
What form of management is recommended for someone under the influence of LSD?
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Which of the following is a common psychological consequence of LSD use?
Which of the following is a common psychological consequence of LSD use?
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What is the common cause of death related to LSD use?
What is the common cause of death related to LSD use?
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How quickly can tolerance to LSD develop?
How quickly can tolerance to LSD develop?
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Which statement best describes the sensory effects of LSD?
Which statement best describes the sensory effects of LSD?
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Study Notes
Plant Poisons
- Plant poisons are substances derived from plants that induce harmful effects when ingested or contacted.
Digitalis
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Cardiac glycosides, of which digitalis is the most known, have a long history in pharmacology.
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Cardiac glycosides are active compounds in various plants, including:
- Digitalis purpurea (purple foxglove)
- Digitalis lanata (white foxglove)
- Mediterranean sea onion (sea squill)
- Oleander
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Active principles include Digoxin, Digitoxin, Digitalin, and Digitonin.
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Digoxin is frequently prescribed for congestive heart failure and atrial arrhythmias, available as 0.125 and 0.25 mg tablets.
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Poisoning causes: Accidental (therapeutic overdose, children), or intentional (suicide).
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Mechanism of action (therapeutic dose):
- Prolongs diastolic period, improving heart filling (negative chronotropic).
- Enhances systolic power, improving contraction (positive inotropic).
- Increases renal blood flow.
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Mechanism of action (toxic dose):
- Cardiac poison.
- Gastrointestinal (GIT) distress.
- Visual disturbances.
- Central nervous system (CNS) symptoms.
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Pathophysiology:
- Stimulates the vagus nerve (bradycardia).
- Inhibits Na+-K+ ATPase, leading to:
- Increased intracellular sodium.
- Increased intracellular calcium.
- Increased extracellular potassium (hyperkalemia) in acute toxicity; normally, serum potassium levels are normal or reduced in chronic toxicity due to diuretic therapy.
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Clinical presentation (Cardiac):
- Arrhythmias are a common manifestation, including both:
- Tachyarrhythmias (e.g. tachycardia, flutter, fibrillation in atrium and ventricle)
- Bradyarrhythmias (e.g., sinus bradycardia, AV block, sinus arrest)
- Arrhythmias are a common manifestation, including both:
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Clinical presentation (Other):
- Gastrointestinal (GIT): Anorexia, nausea, vomiting, colic, diarrhea.
- Visual: Green-yellow vision (rods & cones affection).
- Central Nervous System (CNS): Headache, delirium, disorientation, drowsiness.
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Cause of death: Arrhythmias and cardiac arrest.
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Investigations:
- ECG and continuous cardiac monitor to detect arrhythmias, heart blocks.
- Electrolyte levels (hyperkalemia in acute toxicity, hypokalemia, hypercalcemia, hypomagnesmia in chronic toxicity).
- Kidney function tests (renal impairment affects glycoside elimination).
- Digoxin levels (therapeutic level is 2 ng/mL; levels above 15 ng/mL are serious).
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Treatment:
- Prevent further exposure.
- Supportive measures (e.g., ABCs).
- Gastrointestinal decontamination (e.g. gastric lavage, charcoal, cholestyramine)
- Physiological antidote: Digibind (digoxin-specific antibody fragments). Dosage based on total body digoxin load.
Cannabis Sativa
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Cannabis is a psychoactive drug (psychedelic, psychotomimetic, hallucinogen), used medicinally and recreationally.
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Sources: Cannabis sativa, Cannabis indica
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Forms:
- Hashish: dried resin from flower tops.
- Hashish oil: dark viscous concentrate of cannabinoids.
- Bango: from dried leaves.
- Marijuana: mixture of crushed leaves, flower, and stem.
- Sinsemilla: 'seedless' mixture of flowering tops and leaves of cultivated female plants .
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Active principle: Delta-9-tetrahydrocannabinol (THC), cannabinol, and cannabidiol. THC is the primary.
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Routes of administration: smoking, ingestion, inhalation; also via tablets (Marinol, dronabinol).
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Pharmacokinetics:
- Absorption: Inhalation or ingestion; rapid distribution to brain and adipose tissue
- Metabolism: By liver
- Excretion: Urine and stool
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Poisoning cause: Accidental overdose.
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Mechanism of action
- Effects on basal ganglia, cerebral cortex, cerebellum, hippocampus.
- Stimulates sympathetic receptors and inhibits parasympathetic receptors.
- Effects vary based on user’s mood, THC concentration, and route of administration.
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Clinical presentation (Mental): Euphoria, sexual/erotic dreams, increased sensory sensitivity (auditory, tactile, olfactory), dysphoria, time and space disorientation
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Clinical presentation (Physical): Dilated pupils, conjunctival congestion, tachycardia, orthostatic hypotension, respiratory depression, increased appetite/dry mouth, urinary frequency
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Cause of death: Central asphyxia, car accidents.
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Investigations: Routine investigations, blood and urine samples for THC.
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Treatment
- Supportive measures (ABCs; care of respiration).
- GI decontamination (gastric lavage, charcoal).
- Symptomatic support if needed (e.g., mild sedation with diazepam).
- Psychiatric follow-up.
LSD
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Lysergic acid diethylamide (LSD) is an ergot alkaloid.
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Source: Natural: Claviceps purpurea; Synthetic: LSD
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Mechanism of action:
- Primarily affects the central nervous system (changes in mood and behavior).
- Affects pyramidal & extrapyramidal systems
- Affects sympathetic & parasympathetic systems.
- Has sensory effects
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Clinical presentation (Mental/Physical):
- Euphoria, laughter, dysphoria, sadness, visual distortions (intense colors, depth perception), auditory, tactile, olfactory, and gustatory hallucinations, alterations in time perception, ego disruption, fear of self-destruction.
- Physical symptoms such as mydriasis, hyperthermia, piloerection, hyperglycemia, tachycardia, and hypertension.
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Cause of death: Suicide.
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Management:
- Provide a quiet, lighted environment.
- Reassurance.
- Sedation/Tranquilization (e.g., Diazepam, Chloropromazine).
Drug Dependence
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Definitions:
- Drug of abuse: The use (oral, smoking, etc.) of a substance to alter mood or state of consciousness.
- Substance of abuse: Usage for non-medical reasons, to achieve a state of well-being, or avoid discomfort – often condemned by society.
- Drug habituation: A desire to take drug without compulsion.
- Drug addiction/dependence: Compulsive and repeated drug use resulting in physical and psychological dependence.
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Mechanism of drug dependence:
- Cellular adaptation (neuronal or receptor changes) to the presence of the drug.
- Interruption or decrease in drug administration leading to disturbed cellular function.
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Characteristics of dependence:
- Compulsive desire for drug.
- Tolerance.
- Physical dependence.
- Psychological dependence.
- Withdrawal symptoms.
- Detrimental effects on the individual, family, and society.
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Methods of abuse of addicting drugs:
- Nasal insufflation (e.g., heroin).
- Inhalation (e.g., cocaine).
- Smoking (e.g., hashish).
- Intravenous injection (e.g., morphine).
- Dissolving tabs then intravenous injection
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Types of addicts:
- Therapeutic.
- Professional.
- Street.
- Congenital.
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Description
This quiz explores the harmful effects of plant poisons, specifically focusing on digitalis and its uses in pharmacology. Learn about cardiac glycosides, their mechanisms of action, and the risks associated with digitalis. Test your knowledge on how these substances affect heart conditions and their origins in various plants.