Retrax

Retrax is a brand name associated primarily with two distinct oral anthelmintic (deworming) preparations formulated with Levamisole Hydrochloride:

1. Retrax (Levamisole) Anthelmintic: An oral deworming drug containing Levamisole.

2. Retrax-TZ (Injectable Antibiotic): A combination injectable antibiotic (Ceftriaxone + Tazobactam) used in hospital settings for severe bacterial infections.

(The primary oral medication commonly referred to as “Retrax” is detailed below).

Active Ingredient & Mechanism of Action

• Active Ingredient: Levamisole Hydrochloride.

• Mechanism: Levamisole acts as an acetylcholine receptor agonist on parasite nerve ganglia:

  1. Neuromuscular Paralysis: It induces rapid depolarization and sustained muscular contraction in susceptible nematodes (worms), leading to neuromuscular paralysis.

  2. Natural Expulsion: Paralyzed worms lose their ability to grip the intestinal wall and are naturally flushed out of the body through normal intestinal peristalsis within 24 to 48 hours.

  3. Immunomodulation: Levamisole also possesses secondary immunomodulatory properties that help restore cell-mediated immune function.

Dosage Forms & Available Strengths

Retrax is supplied in oral liquid and solid dosage forms:

• Oral Syrup: 40 mg / 5 mL (typically supplied in 15 mL bottles).

• Oral Tablets: 40 mg tablets (often packaged in blister packs of 3 tablets).

Clinical Indications

Retrax (Levamisole) is indicated for the treatment of intestinal worm infestations:

• Ascariasis (Roundworms): Ascaris lumbricoides

• Hookworm Infections: Ancylostoma duodenale and Necator americanus

• Mixed Nematode Infestations: Infections involving multiple species of susceptible gastrointestinal worms simultaneously.

Key Pharmacokinetics

• Absorption: Rapidly absorbed from the gastrointestinal tract following oral administration.

• Peak Levels: Reaches peak blood plasma levels in approximately 1.5 to 2 hours.

• Metabolism & Elimination: Extensively metabolized by the liver into inactive metabolites; excreted predominantly through the kidneys in urine within 24 to 48 hours.

Administration Guidelines

• Single-Dose Administration: Levamisole is generally administered as a single oral dose calculated based on body weight or age.

• Food Requirements: Can be taken with or without food. Special fasting, purging diets, or laxatives are not required.

• Syrup Usage: Ensure the bottle is shaken well before measuring pediatric doses using a calibrated dosing cup or syringe.

Safety Profile & Considerations

• Common Side Effects: Mild and transient gastrointestinal discomfort, including nausea, vomiting, abdominal cramps, diarrhea, dizziness, and headache.

• Precautions & Warnings:

  • Hepatic or Renal Impairment: Use with caution in patients with pre-existing liver or kidney diseases.

  • Blood Disorders: Prolonged or repeated high-dose administration of levamisole has been associated with blood dyscrasias (such as agranulocytosis/low white blood cell count).

• Pregnancy & Lactation: Avoid use during pregnancy, particularly the first trimester, unless specifically directed by a physician under high-risk clinical necessity.

• Key Drug Interactions:

  • Alcohol: Concomitant intake of alcohol with levamisole can cause a disulfiram-like reaction (flushing, nausea, tachycardia).

  • Anticoagulants (e.g., Warfarin): Levamisole may enhance the anticoagulant effect of warfarin, increasing bleeding risk.

Note: Retrax is a regulated deworming medication. Dosing for young children, underlying conditions, and treatment duration should be verified under the guidance of a healthcare professional.