Hydromorphone Kalceks (Hydromorphone Hydrochloride)

• Hydromorphone is an opioid analgesic used in the management of severe pain pathways.
• Severe acute pain: delivers rapid, strong analgesia for patients experiencing intense, sudden pain.
• Post‑operative pain: controls pain following surgical procedures to facilitate recovery.
• Pain unresponsive to non‑opioid analgesics: offers an alternative when other agents fail to provide adequate relief.

• Hydromorphone acts as a full agonist at the µ‑opioid receptors in the central nervous system. Binding to these G‑protein‑coupled receptors inhibits adenylate cyclase activity, reduces calcium influx, and increases potassium efflux, leading to decreased neuronal excitability and diminished transmission of nociceptive signals, thereby producing analgesia and sedation.

Hydromorphone may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Nausea: feeling of sickness often accompanied by an urge to vomit.
• Constipation: reduced bowel movements and hard stools.
• Drowsiness: increased sleepiness or reduced alertness.
• Dizziness: sensation of light‑headedness or unsteadiness.
• Vomiting: expulsion of stomach contents.
• Sweating: excessive perspiration without exertion.

Serious or Rare Side Effects

• Respiratory depression: slowed or shallow breathing that can be life‑threatening.
• Hypotension: marked drop in blood pressure leading to dizziness or fainting.
• Severe allergic reaction: rash, itching, swelling, or anaphylaxis.
• Adrenal insufficiency: inadequate production of adrenal hormones.
• Seizures: rare occurrence of convulsive episodes.

• When using Hydromorphone, careful assessment and monitoring are essential to minimize risks.
• Assess respiratory function: monitor for depression, especially after dose changes or in opioid‑naïve patients.
• Evaluate renal and hepatic function: adjust therapy if significant impairment is present.
• Avoid use in patients with known hypersensitivity to hydromorphone or its excipients.
• Use caution in the elderly: increased sensitivity to central nervous system effects may occur.
• Pregnancy and breastfeeding: consider only if benefits outweigh potential risks.
• Store below 25°C: keep in original container, protect from light and moisture.

Hydromorphone can interact with several drug classes, altering its safety or efficacy.

Major Interactions (Avoid)

• Concomitant CNS depressants (e.g., benzodiazepines, barbiturates): risk of profound respiratory depression.
• Monoamine oxidase inhibitors (MAOIs): may cause severe hypertension or serotonin syndrome.
• Strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir): increase hydromorphone plasma concentrations.

Moderate Interactions (Monitor Closely)

• CYP3A4 inducers (e.g., rifampin, carbamazepine): may reduce analgesic effect.
• Mixed agonist‑antagonist opioids (e.g., buprenorphine): can precipitate withdrawal symptoms.
• Anticholinergic agents: may exacerbate constipation.