Definition of Chronotherapy Chronotherapy is the practice of timing medication administration to align with the body’s biological rhythms, aiming to maximize therapeutic effect and minimize side effects. Applications of Chronotherapy Especially beneficial for diseases with circadian patterns, such as: Asthma (worsens at night) Hypertension (morning BP surge) Cancer (timing can reduce toxicity) Rheumatoid arthritis (morning … Read more
Biological Clock and Its Significance Biological Clock and Its Significance explain internal timing systems that regulate physiological processes and drug responses. What is a Biological Clock? A biological clock is a molecular system that regulates circadian rhythms—roughly 24-hour cycles in body functions. The master clock in mammals is located in the suprachiasmatic nucleus (SCN) of … Read more
Definition of Rhythms and Cycles in Chronopharmacology In chronopharmacology, rhythms and cycles refer to recurring biological patterns that influence how the body responds to medications over time. These rhythms are regulated by internal biological clocks and can be affected by external cues like light and temperature. Biological Rhythms Biological rhythms are periodic processes in living … Read more
Definition of Chronopharmacology: Chronopharmacology is the study of the effects of biological rhythms on the pharmacokinetics (absorption, distribution, metabolism, and elimination) and pharmacodynamics (the effects of drugs on the body) of drugs. Importance: Biological rhythms can influence the absorption, distribution, metabolism, and elimination of drugs, as well as their effectiveness and toxicity. Understanding these rhythms … Read more
Sources of Arsenic Poisoning Contaminated groundwater (naturally high arsenic areas). Pesticides, herbicides, wood preservatives. Industrial processes: smelting, semiconductor manufacturing. Clinical Symptoms Acute Poisoning: GI distress: Severe vomiting, abdominal pain, diarrhea (“rice-water stools”). Hypotension, shock (from fluid loss). Garlic odor on breath or tissues. Multi-organ failure (cardiac, renal). Chronic Poisoning (Arsenicosis): Skin changes: Hyperpigmentation, hyperkeratosis (especially … Read more
Mercury Poisoning is toxicity due to mercury exposure affecting the nervous system, kidneys, and other organs. Forms of Mercury Elemental Mercury (Hg⁰): Found in thermometers, dental amalgams. Vapor is most toxic. Inorganic Mercury (Hg²⁺ salts): e.g., mercury chloride. Organic Mercury (Methylmercury): From industrial pollution; bioaccumulates in large fish. Clinical Symptoms of Mercury Poisoning Acute Inhalation … Read more
Sources and Overview of Lead Poisoning Common sources: Lead-based paints, contaminated dust or soil, batteries, gasoline additives (older formulations). Chronic exposure is more common, often due to: Occupational settings. Environmental contamination. Clinical Symptoms Neurological: Children: Developmental delay, learning difficulties, irritability, loss of appetite, weight loss, hearing loss. Adults: Peripheral neuropathy (e.g., wrist drop), encephalopathy (in … Read more
Overview of Organophosphorus (OP) Compound Poisoning OP compounds are cholinesterase inhibitors used as pesticides (e.g., parathion, malathion, diazinon). They cause accumulation of acetylcholine (ACh) → overstimulation of muscarinic and nicotinic receptors. Clinical Symptoms (Cholinergic Syndrome) Mnemonic: SLUDGE-M or DUMBBELSS + Killer B’s Salivation Lacrimation Urination Diarrhea GI upset Emesis Miosis (pupil constriction) Muscle twitching, weakness, … Read more
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
