PEGLEC SACHET

Indications

• Dehydration
• Hyponatremia
• Hypernatremia
• Hypokalemia
• Hyperkalemia
• Hypocalcemia
• Hypercalcemia
• Hypomagnesemia
• Hypermagnesemia
• Acid-base imbalances

Dosage

Children: Electrolyte dosing in children varies depending on the specific electrolyte and the child's condition. Refer to pa

Adults: Electrolyte dosing varies based on the specific electrolyte and the clinical situation. Refer to specific guidelines or consult with a healthcare professional for appropriate dosing.

Mechanism of action

Electrolytes exert their effects by dissociating into ions in solution, which then participate in various physiological processes. For instance, sodium and potassium ions are crucial for generating action potentials in neurons and muscle cells, while calcium ions are vital for muscle contraction and neurotransmitter release. The movement of these ions across cell membranes is regulated by transporters and channels, influencing cellular excitability and overall homeostasis.

Pharmacodynamics

Electrolytes function mainly through their roles in fluid balance and neuromuscular activity. Sodium is primarily involved in maintaining osmotic pressure and is vital for the conduction of electrical impulses in nerves and muscles. Potassium is critical for cardiac rhythm and muscle function. Calcium is essential for muscle contractions, neurotransmitter release, and blood coagulation. Magnesium serves as a cofactor for numerous enzymatic reactions and helps regulate calcium levels.

Pharmacokinetics

Electrolytes are absorbed in the gastrointestinal tract and distributed throughout the body fluids. Their levels are regulated by the kidneys, which filter excess electrolytes to maintain homeostasis. Electrolytes can be lost through sweat, urine, and feces, and their replacement may be necessary in cases of dehydration, diarrhea, or other conditions causing imbalances. The half-lives of various electrolytes can vary, but they are typically rapidly equilibrated within the body's compartments.

Contra-indications

• Severe renal impairment
• Hyperkalemia
• Hypercalcemia
• Hypermagnesemia
• Severe dehydration

Adverse effects

• Nausea
• Vomiting
• Diarrhea
• Abdominal cramps
• Hypernatremia
• Hypokalemia
• Hyperkalemia
• Arrhythmias
• Muscle weakness

Interactions

• Diuretics (especially potassium-sparing diuretics may increase serum potassium levels)
• ACE inhibitors (may increase potassium levels)
• Lithium (sodium fluctuations can affect lithium levels)
• Digoxin (potassium levels can influence digoxin toxicity)

Precautions

• Monitor serum electrolyte levels regularly
• Use with caution in patients with renal impairment
• Monitor patients with cardiac conditions closely
• Assess fluid status and hydration before administration

Pregnancy

Electrolyte supplementation should be managed carefully during pregnancy, considering the specific needs of the mother and fetus.

Breast-feeding

Electrolytes are generally safe during breastfeeding, but specific needs should be evaluated.

Storage

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

Formulations

• Oral electrolyte solutions
• Intravenous electrolyte solutions
• Electrolyte tablets or powders

Dosage

Children: Refer to the BNF for Children for appropriate dosing information in paediatric cases, especially in instances of overdose.

Adults: Refer to the BNF for specific dosing information based on clinical circumstances, particularly in cases of overdose.

Mechanism of action

Ethylene glycol is metabolized by alcohol dehydrogenase to glycoaldehyde, which is subsequently converted to glycolic, glyoxylic, and oxalic acids. These metabolites contribute to anion gap metabolic acidosis and are responsible for tissue injury through the formation of insoluble calcium oxalate crystals.

Pharmacodynamics

The toxicity of ethylene glycol arises from its metabolites, particularly glycolic and oxalic acids. These compounds induce metabolic acidosis, lead to renal failure through calcium oxalate crystal deposition in the kidneys, and can cause neurological impairment. The anion gap increases due to the accumulation of these acids, leading to complications such as cardiovascular instability and potential multi-organ failure.

Pharmacokinetics

Ethylene glycol is rapidly absorbed after oral ingestion. It undergoes first-pass metabolism primarily in the liver, where it is converted into its toxic metabolites. The elimination half-life of ethylene glycol varies but is generally prolonged in cases of renal impairment. Renal excretion of metabolites contributes to the duration of toxicity, necessitating prompt medical intervention in cases of overdose.

Adverse effects

• Metabolic acidosis
• Renal failure
• CNS depression
• Hypocalcemia
• Cardiovascular collapse
• Pulmonary edema

Precautions

• Use with caution in patients with renal impairment
• Monitor for signs of metabolic acidosis
• Evaluate electrolyte levels, particularly calcium

Pregnancy

There is limited data on the safety of ethylene glycol in pregnancy. It should only be used if clearly needed.

Breast-feeding

It is unknown if ethylene glycol is excreted in human milk. Caution is advised.

Storage

Store in a tightly closed container at room temperature, away from heat and moisture.

Formulations

• Liquid

Indications

• Constipation
• Bowel preparation prior to surgical procedures or diagnostic tests

Dosage

Children: Refer to specific guidelines or BNF for Children for dosing information.

Adults: Refer to specific guidelines or BNF for detailed dosing information.

Mechanism of action

Polyethylene glycol works by osmotically retaining water in the intestinal lumen, which increases the water content of the stool. This enhances the passage of stool through the intestines and promotes bowel movements. The high molecular weight of polyethylene glycol prevents its absorption in the gastrointestinal tract, ensuring that it remains in the lumen to exert its effects.

Pharmacodynamics

The pharmacodynamic profile of polyethylene glycol involves its ability to increase stool water content, thereby reducing stool consistency and facilitating easier passage. It does not stimulate intestinal motility directly but rather relies on the osmotic effect to promote bowel evacuation. The onset of action typically occurs within 24 to 96 hours after ingestion.

Pharmacokinetics

Polyethylene glycol is not absorbed systemically, and its pharmacokinetics are characterized by its presence solely in the gastrointestinal tract. It is excreted unchanged in the stool. The volume of polyethylene glycol administered can influence the effectiveness and timing of its action, but its absorption is negligible, making systemic side effects rare.

Adverse effects

• Abdominal cramping
• Diarrhea
• Nausea
• Vomiting
• Bloating
• Flatulence

Precautions

• Use with caution in patients with gastrointestinal disorders or bowel obstruction.
• Ensure adequate hydration during use to prevent dehydration.

Pregnancy

Polyethylene glycol is generally considered safe during pregnancy, but should be used under medical supervision.

Breast-feeding

Polyethylene glycol is excreted in breast milk in very small amounts and is generally regarded as safe during breastfeeding.

Storage

Store at room temperature, away from moisture and heat.

Formulations

• Powder for oral solution
• Liquid formulation

Mechanism of action

Ethylene glycol is metabolized by alcohol dehydrogenase to glycoaldehyde, which is then metabolized to glycolic, glyoxylic, and oxalic acids. These acids, along with excess lactic acid are responsible for the anion gap metabolic acidosis. Oxalic acid readily precipitates with calcium to form insoluble calcium oxalate crystals. Tissue injury is caused by widespread deposition of oxalate crystals and the toxic effects of glycolic and glyoxylic acids.