Hyoscine Butylbromide Kalceks (Hyoscine Butylbromide)

Hyoscine Butylbromide acts on smooth‑muscle receptors to relieve spasm in several gastrointestinal and urinary conditions.

• Abdominal pain and cramps: reduces painful muscle contractions in the gut.
• Gastrointestinal spasm: eases involuntary contractions of the intestinal wall.
• Biliary colic: alleviates spasms of the biliary ducts.
• Renal colic: diminishes ureteral smooth‑muscle spasm.
• Urinary tract smooth‑muscle spasm: relaxes the bladder neck and urethra during spasmodic episodes.

• Hyoscine Butylbromide competitively blocks muscarinic acetylcholine receptors (M1–M5) on smooth‑muscle cells, preventing acetylcholine‑mediated contraction. This antagonism leads to relaxation of gastrointestinal, biliary, urinary and vascular smooth muscle, thereby decreasing spasm and associated pain without crossing the blood‑brain barrier.

Hyoscine Butylbromide may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Dry mouth: reduced salivary secretion.
• Blurred vision: temporary difficulty focusing.
• Tachycardia: mild increase in heart rate.
• Constipation: slowed intestinal transit.
• Urinary retention: difficulty emptying the bladder.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Severe hypotension: sudden drop in blood pressure.
• Paralytic ileus: marked cessation of intestinal motility.
• Acute glaucoma: rapid increase in intra‑ocular pressure.
• Skin necrosis: rare severe skin ulceration.

Before using Hyoscine Butylbromide, clinicians should consider patient‑specific factors and monitor for adverse events.

• Cardiac history: assess for arrhythmias or tachycardia risk.
• Glaucoma: avoid in patients with narrow‑angle glaucoma.
• Renal/hepatic function: adjust use if severe impairment is present.
• Elderly patients: start with the lowest effective dose and monitor closely.
• Known hypersensitivity: discontinue if allergic signs appear.
• Store at ambient temperature: keep in original container, protect from moisture and light.

Hyoscine Butylbromide can interact with other medications that affect the autonomic nervous system or gastrointestinal motility.

Major Interactions (Avoid)

• Other anticholinergic agents: additive anticholinergic burden may cause severe dry mouth, tachycardia, or urinary retention.
• Potent antiarrhythmics (e.g., quinidine): may exacerbate cardiac conduction abnormalities.
• Opioid analgesics: combined effect can markedly reduce gastrointestinal motility.

Moderate Interactions (Monitor Closely)

• Antihistamines: may increase dry mouth and blurred vision.
• Tricyclic antidepressants: potential for enhanced anticholinergic side effects.
• Beta‑blockers: possible additive effect on heart rate.
• Antihypertensives: monitor blood pressure for additive hypotensive effect.
• CYP3A4 inhibitors: may modestly increase plasma levels, though metabolism is limited.