Overview of Morphine (Opioid) Poisoning Morphine is a potent opioid analgesic that acts on mu-opioid receptors in the CNS. Overdose leads to CNS and respiratory depression. Clinical Symptoms Pinpoint Pupils (Miosis): Classic sign (though may be absent in mixed overdoses). Respiratory Depression: Slow, shallow breathing—primary cause of death. CNS Depression: Drowsiness, stupor, coma. Cardiovascular: Hypotension, … Read more

Overview of Barbiturates Poisoning Barbiturates are sedative-hypnotic drugs that enhance GABA activity, an inhibitory neurotransmitter in the CNS. Common examples: Phenobarbital, Pentobarbital, Thiopental. Clinical Symptoms CNS Depression: Lethargy, drowsiness, confusion → coma (in severe cases). Respiratory Depression: Shallow, slow breathing; may progress to respiratory arrest. Cardiovascular Effects: Hypotension, bradycardia (especially with high doses). Other Signs: … Read more

General principles of treatment of poisoning The general principles of treatment of poisoning depend on the specific poison involved and the severity of the poisoning. However, the following principles are commonly used in the treatment of poisoning: General Management Strategy Initial Assessment: Airway, Breathing, Circulation (ABCs): Ensure airway patency, adequate ventilation, and stabilize circulation. Vital … Read more

Definition of Mutagenicity: Mutagenicity refers to a substance’s ability to cause changes (mutations) in the DNA of living organisms. A mutagen is an agent that can increase the frequency or extent of mutations beyond the natural background rate. Types of Mutations: Point mutations: Changes in a single base pair (e.g., G to A). Frameshift mutations: … Read more

Definition of Teratogenicity: Teratogenicity is the capability of a substance to cause malformations or defects in an embryo or fetus during pregnancy. Mechanisms of Teratogenicity: Interference with cell division and differentiation: During organogenesis, the fetus’s rapidly dividing cells are highly vulnerable to disruptions. Nutritional deficiencies: Some substances can cause malnutrition in the mother or fetus, … Read more

Definition of Carcinogenicity: Carcinogenicity refers to the ability of a substance to induce or increase the incidence of cancer. A carcinogen can be a chemical, physical agent (like radiation), or biological agent (like certain viruses). Stages of Carcinogenesis: Initiation: A mutagenic event leads to genetic changes in cells. Promotion: The altered cells are stimulated to … Read more

Definition of Genotoxicity: Genotoxicity is the property of a substance to damage the genetic material (DNA) within a cell. This damage can manifest as breaks in DNA strands, alterations in base pairs, or formation of DNA adducts. Mechanisms of Genotoxicity: Direct interaction with DNA: Some chemicals can directly bind to DNA, causing structural changes or … Read more

Definition of Chronic Toxicity: Chronic toxicity results from continuous or repeated exposure to a toxicant over a long period—usually more than 3 months and often extending to years. It is associated with cumulative damage and may involve irreversible health effects. Characteristics of Chronic Toxicity: Prolonged exposure to low or moderate doses. Slow buildup of toxins … Read more

Subacute Toxicity refers to adverse effects from repeated exposure to a substance over a short duration, usually weeks. Definition of Subacute toxicity: It refers to the adverse effects resulting from repeated or continuous exposure to a toxic substance over a period of a few days up to about 28 days. It represents the intermediate phase … Read more

Definition of Acute toxicity: Acute toxicity refers to the harmful effects that occur following a single exposure or multiple exposures to a substance over a short period, typically less than 24 hours. It is commonly assessed using the lethal dose (LD₅₀), which represents the dose required to kill 50% of a test population (often lab … Read more