Asitrax Syrup

Asitrax is the active laevo-isomer of tetramisole. It works by paralysing susceptible intestinal worms which are then excreted from the intestines. Asitrax also enhances cellular immune responses in humans.


Asitrax is a fast acting drug which acts on nematode nerve ganglia paralysing the worm’s musculature within seconds of contact. Unable to maintain their position, the worms are then ejected by normal peristaltic movement, usually within 24 hours of levamisole administration. Although it is certain that levamisole primarily influences the neuromuscular system of nematodes, it is possible that in some helminthes the inhibition of the fumarate reductase system contributes to the anthelmintic efficacy of levamisole. Asitrax is used for the treatment of infections by the following gastrointestinal wormspecies:

  • Ascaris lumbricoides: Roundworm
  • Necator americanus: Hookworm
  • Ancylostoma duodenal: Hookworm
  • E nterobius vermicularis: Pinworm
  • Trichuris trichuria: Whipworm
  • Strongyloides stercoralis: Threadworm
  • Trichostrongylus colubriformis

Asitrax is also used to associated treatment for these conditions: Adenocarcinoma of Colon, Ancylostoma duodenale infection, Ascaris lumbricoides infection, Carcinoma, Colorectal, Enterobius vermicularis infection, Necatoriasis due to necator americanus, Strongyloides Stercoralis Infection, Trichuris Infection

Trade Name Asitrax
Generic Levamisole
Other Names Levamisol, Levamisole, Levamisolum
Weight 40mg/5ml
Type Syrup
Formula C11H12N2S
Weight Average: 204.291
Monoisotopic: 204.072119084
Protein binding


Therapeutic Class Anti-helminthic
Manufacturer Asiatic Laboratories Ltd
Available Country Bangladesh
Last Updated: June 23, 2021 at 11:22 am


Asitrax dosage

The following doses of Asitrax are given as a single administration, preferably after a light meal.

  • Age 1-4 year: 1 Tablets or 5 ml Syrup
  • Age 5-15 year: 2 Tablets or 10 ml Syrup
  • Age 16 year and over: 3 Tablets or 15 ml Syrup

In cases of severe hookworm infection it is suggested that a second standard dose be given one or seven days after the first, whichever timing is feasible.

Side Effects

Side-effects are infrequent. They are usually mild and transient and include nausea, vomiting, abdominal pain, giddiness(dizziness) and headache. An encephalopathylike syndrome has been reported to have occurred in a few patients two or three weeks after treatment.


Effect on ability to drive or operate machinery: There is no evidence to suggest that Asitrax , used for anthelmintic purpose, will produce sedation. Mild and transient giddiness is an infrequent side-effect of treatment. No precautions are suggested concerning the ability to drive or operate machinery.

In case of concurrent microfilaraemia transient fever may occur.


May increase toxicity of phenytoin. Increases bioavailability of ivermectin; decreases bioavailability of albendazole. Alcohol causes disulfiram-like reaction.

Food Interaction

  • Take on an empty stomach.

Half Life

4.4-5.6 hours (biphasic)

Pregnancy & Breastfeeding use

Although studies in animals have shown that Asitrax produces no teratogenic effects, current medical practice requires that the benefits of any drug used during pregnancy should be weighed against the possible dangers.


There is no absolute contra-indication to the use of Asitrax

Acute Overdose

Counter possible anticholinesterase activity with e.g. atropine. Control blood pressure and respiration . Do not use sedatives.

Storage Condition

Tablet: Store in room temperature and protect from moisture.

Syrup: Store in room temperature and protect from light.