What is pranosin?

Pranosine® is a synthetically manufactured medication that uses metisoprinol as its active ingredient, a chemical compound that belongs to the line of medications with antiviral and immunomodulatory effects, useful in viral infections .

To highlight: This medication is commercially produced by the company called Laboratorios Sanfer SA de CV (1)

What is pranosine used for?

  • Pranosine®, due to its antiviral action , inhibits the replication of viruses, which affect the health of many patients with diseases of viral origin. (two)
  • It is used to treat: 
    • Childhood viral rashes such as chickenpox, measles, and rubella.
    • Herpes simplex (labial and facial), genital herpes and herpes zoster.
    • Rhinopharyngitis of viral etiology.
    • Hepatitis.
    • Parotitis. (3)

Dosage and routes of administration of pranosine

The presentation of pranosine® is in 500 mg tablets and 250 mg/5 ml metisoprinol syrup, in a 60 ml bottle. The route of administration in both cases is oral and the dose as a reference can be the following:

  • Syrup every 4 hours: Children 1 to 12 months of age 2.5 ml; from 1 to 5 years of age 5 ml and from 5 to 12 years of age 7.5 ml.
  • Tablets: Adults should start with an initial dose of 2 x 500 mg tablets and then 1 x 500 mg tablet every 4 hours.

Pranosine Side Effects

The use of pranosine® can cause some of the following adverse effects in certain patients :

  • Possible allergic reactions due to contact with any component of pranosine®. 
  • Nausea.
  • gastritis .
  • Possible increase in uric acid in the blood.

Important: If the mentioned effects or any other symptoms not included in this list appear, please stop the treatment and notify your doctor .

Contraindications and warnings of pranosine

Treatment with pranosine® is contraindicated in any of the following circumstances:

  • Hypersensitivity to any of the formula’s components.
  • Patients with rheumatic diseases such as gout.
  • During the period of pregnancy.
  • During the lactation period .

You should know: It is advisable to provide your doctor with all the information related to your state of health , before starting treatment with this drug.

Avoid if you have:

  • History of hypersensitivity to metisoprinol.
  • gouty arthritis


  • Products such as pranosine® must be administered with a prescription or medical prescription.
  • Keep this pharmaceutical product out of the reach of children.
  • Store this medicine in a cool dry place.

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