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ISOPRINOSINE® - Newport Pharmaceuticals

Isoprinosine is the main product of Newport Pharmaceuticals of Costa Rica. The active ingredient identified in the pharmacopoeias is Methisoprinol (Inosine Pranobex). It is a non-toxic immune system stimulant prescribed in the treatment of numerous viral illnesses including herpes simplex, hepatitis, eruptive diseases of infancy and other viral afflictions related with immuno-deficiencies.

  • Methisoprinol was patented in the United States in 1969. Later, to protect the company’s intellectual property, the patent was registered in sixty-two countries.
  • Isoprinosine is an immunestimulant drug prescribed for the treatment of several viral diseases including herpes simplex, Herpes Zoster, viral hepatitis, childhood eruptive diseases, and other viral infections that occur with immunodeficiencies.
  • In 1982 Isoprinosine received in France the renown "Le Prix Galien". At that time, Isoprinosine was considered the main therapeutic innovation introduced in the French market.

The drug has demonstrated clinical activity against influenza symptoms, common cold, viral encephalitis, herpes and severe manifestations of immunodeficiencies. Besides, it is a non-toxic drug with an excellent record of clinical security in short and long term therapeutic treatments.



Newport pharmaceuticals, along the years, has published more than one thousand seven-hundred and fifty clinical studies about ISOPRINOSINE. Some have been published in scientific magazines of excellent reputation such as the New England Journal of Medicine and Lancet.

The clinical studies on ISOPRINOSINE have been conducted by independent scientists and doctors at prestigious research centers in the United States and Europe.

The following therapeutic indications have abundant scientific support in published clinical studies:

  • Primary and secondary breathing infections in adults and children
  • Hepatitis and immunodepression
  • Labial herpes, genital herpes, Keratis Herpes, Herpes Zoster
  • Chicken pox
  • Citomegalovirus and Epstein Bar infection
  • Measles
  • Subacute sclerosing panencephalitis
  • Papilloma

In June of 1990, it was published in the New England Journal of Medicine the double blind clinical study called "The efficacy of Pranobex in the prevention of the Acquired immunodefieiency Syndrome in patients infected by the virus of human immunodeficiency". It included eight-hundred and sixty-six patients, who had not completely developed AIDS. The investigation was carried out in twenty-one distinguished hospitals of Sweden and Denmark. The technical conclusion was : Isoprinosine delays the onset of AIDS in patients infected with HIV virus.

Dr. Rodrigo Zavaleta, our resident pharmacologist at Farmacia Sucre

Dr. Rodrigo Zavaleta, our resident pharmacologist at Farmacia Sucre, is always available to discuss your pharmaceutical needs... and, to review any health issues that may be of concern to you.

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The Complete Online Medical Directory of Costa Rica
Last Published on January 01, 2006 by Edenia Systems International