Post-surgery sedative and painkiller → needs an opioid analgesic
Morphine = natural opioid from opium poppy → binds mu-opioid receptors → pain relief + sedation ✓
Cocaine = stimulant (local anaesthetic, not painkiller) ✗
LSD = psychedelic hallucinogen ✗ | Amphetamine = stimulant ✗
Answer: Morphine
Classification: Opioids (narcotics): morphine, heroin, codeine, fentanyl. Medical: pain relief. Abuse potential: high. Sedatives-hypnotics: barbiturates, benzodiazepines. Medical: anxiety, sleep, epilepsy. Stimulants: cocaine, amphetamine. Medical use: ADHD (amphetamine/methylphenidate), local anaesthetic (cocaine). Psychedelics: LSD, psilocybin. No established medical use (though research ongoing). Cannabis: pain, nausea, glaucoma.
Understanding morphine and opioids is medically crucial because of the global opioid crisis (particularly severe in North America): over-prescription of opioid painkillers → dependence → transition to heroin → overdose deaths. Fentanyl: 100x more potent than morphine; illicitly manufactured fentanyl now contaminates the heroin supply → mass overdose deaths. Naloxone (Narcan): opioid antagonist available over-the-counter in many countries → reverses overdose. Treatment: methadone/buprenorphine maintenance therapy.
Post-surgical pain management (multimodal approach): Paracetamol (acetaminophen): mild-moderate pain, antipyretic. NSAIDs (ibuprofen, diclofenac): anti-inflammatory and analgesic. Regional anaesthesia: nerve blocks, epidural. Opioids: moderate-severe pain (morphine, oxycodone, fentanyl). Ketamine: dissociative anaesthetic with analgesic properties. Goal: minimise opioid use while achieving adequate pain control.
Papaver somniferum (opium poppy) latex contains: Morphine (~10-15% of raw opium), Codeine (~1-3%): milder opioid, antitussive (cough suppressant), Thebaine: starting material for semi-synthetic opioids (oxycodone, buprenorphine, naloxone), Papaverine: smooth muscle relaxant. All opioids ultimately trace their activity to binding opioid receptors in the central nervous system.
Opioids such as heroin, obtained by acetylation of morphine, bind receptors in the central nervous system and depress body functions. Cannabinoids from Cannabis sativa act on brain receptors and affect the cardiovascular system. Coca alkaloids, chiefly cocaine, interfere with dopamine transport and produce a sense of euphoria followed by depression. Barbiturates, amphetamines and benzodiazepines are medically useful as sedatives and tranquillisers but are widely abused.
Morphine is an effective painkiller used after surgery, and barbiturates and benzodiazepines are prescribed for anxiety and insomnia. The distinction between medicine and abuse is dose, purpose and supervision rather than the molecule itself. Atropine from Atropa belladonna and drugs from Datura are similarly both therapeutic and hallucinogenic. Exam questions often test whether you can name a drug that is both.
Adolescence is the period of greatest risk, driven by curiosity, peer pressure and the desire to escape stress. Warning signs include falling academic performance, withdrawal from family, changed sleeping and eating patterns, and unexplained need for money. Prevention measures emphasised in NCERT are avoiding undue peer pressure, education and counselling, seeking help from parents and peers, looking for help from qualified professionals, and channelling energy into other activities.
Assuming all abused drugs are illegal substances. Several are prescription medicines. Barbiturates and benzodiazepines have legitimate medical uses and are abused when taken outside them.
Confusing the plant sources. Cannabinoids come from Cannabis sativa, cocaine from Erythroxylum coca, and opioids from the poppy Papaver somniferum.