KEXELATE 100MG/G POWDER

Indications

• Hyperkalemia
• Chronic kidney disease with elevated potassium levels
• Management of certain toxicities (e.g., digoxin toxicity) in conjunction with other treatments

Dosage

Children: Refer to established clinical guidelines for specific pediatric dosing information, as it is based on weight and clinical condition.

Adults: Refer to established clinical guidelines for specific dosing information, as it may vary based on the severity of hyperkalemia and the clinical setting.

Mechanism of action

Sodium polystyrene sulfonate acts as a cation-exchange resin in the intestines, where it exchanges sodium ions for potassium ions. This process facilitates the elimination of potassium from the body through feces, effectively lowering serum potassium concentrations.

Pharmacodynamics

The primary pharmacodynamic effect of sodium polystyrene sulfonate is the reduction of serum potassium levels. The resin binds potassium in the gastrointestinal tract, leading to an increase in potassium excretion. The onset of action can vary; however, the drug generally takes several hours to exert its effects, with peak potassium-lowering effects occurring after a few hours.

Pharmacokinetics

Sodium polystyrene sulfonate is not absorbed systemically; its action is confined to the gastrointestinal tract. The resin passes through the intestines unaltered and is excreted in feces. The duration of action is dependent on the amount of potassium present in the gut and the total resin dose administered. Its elimination is essentially through fecal excretion.

Contra-indications

• Hypokalemia
• Severe gastrointestinal obstruction
• Bowel perforation

Adverse effects

• Electrolyte disturbances
• Gastrointestinal irritation
• Constipation
• Nausea
• Vomiting
• Abdominal discomfort

Interactions

• May decrease the absorption of certain medications due to delayed gastric emptying
• Caution when used with other medications that can affect potassium levels

Precautions

• Use with caution in patients with renal impairment
• Monitor electrolyte levels during therapy
• Ensure adequate hydration to prevent constipation

Pregnancy

Use only if clearly needed and after assessing potential benefits versus risks, as safety during pregnancy has not been fully established.

Breast-feeding

It is not known if polystyrene is excreted in human milk. Use with caution and assess the necessity.

Storage

Store at room temperature, away from moisture and heat. Keep out of reach of children.

Formulations

• Polystyrene sulfonate (sodium or calcium) in powder form
• Polystyrene sulfonate suspension

Mechanism of action

Sulfonates operate through various biochemical pathways, such as sulfoacetaldehyde degradation and dissimilatory sulfate reduction. They facilitate the conversion of sulfate to hydrogen sulfide in anaerobic conditions, which is a critical process in sulfur metabolism. Additionally, they are involved in the degradation of compounds like tetrachloroethene and hypotaurine, highlighting their role in bioremediation and detoxification.

Pharmacodynamics

The pharmacodynamics of sulfonates are influenced by their ability to interact with biological systems, particularly in microbial environments. They can alter metabolic pathways, enhance the solubility of substances, and impact the bioavailability of various compounds. Their role in sulfate reduction is significant for energy production in certain bacteria, which can utilize sulfates as terminal electron acceptors.

Pharmacokinetics

Sulfonates typically exhibit variable absorption and distribution profiles depending on their specific structure and the presence of other functional groups. Their metabolism often occurs through microbial action, particularly in anaerobic environments, leading to the formation of metabolites like hydrogen sulfide. The elimination of sulfonates can occur via microbial degradation or chemical transformation in the environment.

Pregnancy

There is limited information on the safety of sulfonates during pregnancy. Consult relevant guidelines before use.

Breast-feeding

It is unclear whether sulfonates pass into breast milk. Caution is advised when administering to breastfeeding mothers.

Storage

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