BROOKLAX PILLS 192MG TABLET

Indications

• Constipation
• pH indicator in laboratory settings

Dosage

Children: Refer to the BNF for Children for appropriate dosing guidelines.

Adults: Refer to relevant clinical guidelines or product inserts for specific dosing information.

Mechanism of action

Phenolphthalein works primarily as a pH indicator, changing color in response to the acidity or basicity of the solution. In the context of its laxative effect, it may stimulate peristalsis in the intestines by irritating the bowel lining, although the exact mechanism of action for its laxative effects is not fully understood.

Pharmacodynamics

Phenolphthalein's pharmacodynamic properties are largely related to its role as a laxative and pH indicator. As a laxative, it increases intestinal motility and promotes the secretion of mucus and fluids in the intestines, leading to softer stools and easier passage. The compound's transition from colorless to pink at a pH of around 8.2 to 10 makes it a useful tool in laboratory settings to determine the acidity of a solution.

Pharmacokinetics

Phenolphthalein is absorbed in the gastrointestinal tract and metabolized by the liver. Its onset of action as a laxative typically occurs within 6 to 12 hours after oral administration. The elimination half-life varies but is generally considered to be short. It is primarily excreted in the urine, and its metabolites may also be present in the feces. The pharmacokinetic profile can vary based on individual patient factors and the presence of other medications.

Contra-indications

• Hypersensitivity to phenolphthalein or any of its components
• Severe renal impairment
• Gastrointestinal obstruction

Adverse effects

• Abdominal cramps
• Diarrhea
• Nausea
• Vomiting
• Electrolyte imbalances
• Allergic reactions (e.g. rash, urticaria)

Interactions

• May interact with other laxatives, leading to increased risk of dehydration and electrolyte imbalances
• Antacids may affect the absorption of phenolphthalein

Precautions

• Use with caution in patients with gastrointestinal disorders
• Monitor renal function in patients with pre-existing kidney conditions
• Avoid prolonged use to prevent dependence and electrolyte disturbances

Pregnancy

Phenolphthalein is not recommended during pregnancy due to lack of safety data. Consult a healthcare provider for alternatives.

Breast-feeding

Limited data available, use with caution and consult a healthcare provider.

Storage

Store in a cool, dry place away from light. Keep out of reach of children.

Formulations

• Oral tablets
• Liquid formulations for bowel preparation