TOXICOLOGY: Prescription & Non-Prescription Medications + Drugs of Abuse
Toxicity
Toxicology = the science of poisoning, studying how substances cause harm, how the body reacts, and how we treat the damage.
Every drug is a potential toxin — dose hi poison banata hai 🥼
1. Prescription Medications (Rx)
These are drugs given only on a doctor’s order.
They’re powerful, helpful, but risky if misused.
Common Toxic Issues
| Drug Class | Toxic Effects | Why It Happens | Antidote / Management |
|---|---|---|---|
| Opioids (morphine, fentanyl, tramadol) | CNS + respiratory depression, coma | overdose / mixing with alcohol | Naloxone |
| Benzodiazepines (diazepam, alprazolam) | Sedation, memory loss, hypotension | chronic use or overdose | Flumazenil |
| Antidepressants (TCAs) | Arrhythmias, seizures | narrow therapeutic index | Sodium bicarbonate |
| Anticoagulants (warfarin) | Bleeding, bruising | dosing errors | Vitamin K |
| Paracetamol in high dose (even though OTC) | Liver failure | toxic metabolite NAPQI buildup | N-acetyl cysteine (NAC) |
Main Takeaway: Prescription drugs go wild when dose exceeds control.
2. Non-Prescription / OTC Medications
Everyone thinks they’re harmless, but bhai ye silent killers hote hain when abused.
| Drug | Toxicology | Signs & Symptoms |
|---|---|---|
| Paracetamol | Hepatotoxicity | Jaundice, vomiting, liver failure |
| NSAIDs (Ibuprofen, Diclofenac) | GI bleeding, kidney injury | Abdominal pain, hematemesis |
| Antihistamines (chlorpheniramine, diphenhydramine) | Anticholinergic toxicity | Dry mouth, hallucination, convulsions |
| Cough syrups (dextromethorphan) | CNS depression, dependency | Euphoria, confusion, respiratory suppression |
Learning? OTC ≠ Safe. Respect the dosage.
3. Drugs of Abuse
Used for pleasure, escape, or thrill — but they hijack the brain reward system, causing dependence & deadly toxicity.
Major Categories
| Drug | Effects | Toxic Signs | Long-Term Damage |
|---|---|---|---|
| Alcohol | Relaxation | Vomiting, coma | Cirrhosis |
| Nicotine | Alertness | Tachycardia | Cancers, COPD |
| Cannabis (Marijuana) | Euphoria | Anxiety, hallucination | Cognitive decline |
| Cocaine / Crack | Energy rush | Heart attack, stroke | Psychosis |
| Heroin / Opium | Euphoria | Respiratory arrest | Infections, HIV risk |
| Amphetamines / MDMA | Hyperactivity | Hyperthermia, seizures | Neurotoxicity |
| LSD | Hallucination | Bad trip, panic | Flashbacks |
Addiction cycle:
Use → Reward surge → Craving → Tolerance → Withdrawal → Dependence → Destruction.
Pathophysiology Behind Drug Toxicity (Quick Corporate Summary)
- Receptor over-stimulation
- Organ toxicity (liver, kidney, heart, brain)
- Metabolite accumulation
- Respiratory or cardiovascular collapse
- Neurochemical imbalance
Management Principles (Golden Rules)
- Remove the drug (decontaminate: gastric lavage, activated charcoal)
- Antidote if available
- Support vital functions (Airway, breathing, circulation)
- Enhance elimination (Dialysis / alkalinization)
- Prevent complications
- Counselling + rehabilitation (for drug abuse)
One-Line Wisdom
The same drug that heals can kill — dose, discipline, and knowledge decide the outcome.
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