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Inosine Pranobex

A Preliminary Review of its Pharmacodynamic and Pharmacokinetic Properties, and Therapeutic Efficacy

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Summary

Synopsis: Inosine pranobex 1 is a synthetic compound formed from the p-acetamido benzoate salt of N-N dimethylamino-2-propanol and inosine in a 3 : 1 molar ratio. It has been reported to exert antiviral and antitumour activities in vivo which are secondary to an immunomodulating effect, and early results suggest beneficial clinical effects in several diseases and infections including mucocutaneous Herpes simplex infections, subacute sclerosing panencephalitis, genital warts, influenza, zoster, and type B viral hepatitis, as well as in homosexual men with persistent generalised lymphadenopathy. However, many of the studies have been preliminary in nature and deficient in design or in the reporting of their results. One must therefore conclude that while inosine pranobex may prove to be a valuable and innovative therapy for a number of diseases and infections for which no satisfactory therapy exist, further long term well controlled studies in larger numbers of patients are required before definitive conclusions about the efficacy of inosine pranobex in these disorders will be possible.

Pharmacodynamic Studies: The in vivo antiviral and antitumour effects of inosine pranobex are secondary to the immunomodulating activity of the drug. Although reports of poor in vitro antiviral activity of inosine pranobex are often in conflict with the reported in vivo antiviral activity of the drug, synergistic antitumour activity has been reported both in vitro and in vivo when the drug was used in combination with fluorouracil.

In vitro exposure of cells to inosine pranobex induces T-lymphocyte differentiation and potentiation of induced lymphoproliferative responses. The drug has been shown to modulate T-lymphocyte and natural killer cell cytotoxicity, suppressor and helper cell functions, as well as to increase the number of IgG and complement surface markers. Interleukin-1 and -2 production, and neutrophil, monocyte and macrophage chemotaxis and phagocytosis are also potentiated by inosine pranobex.

Some of the immunomodulating effects listed above have also been demonstrated in cells from patients administered the drug. In a double-blind comparison in patients with Herpes zoster, inosine pranobex produced a significantly greater restoration of E-rosette activity than placebo, and in 3 of 5 double-blind comparisons in patients with initial or recurrent Herpes simplex genitalis or labialis the drug significantly improved one or two of several immunological responses tested (phytohaemagglutinin response, lymphotoxin production, lymphocyte transformation response, skin test reactivity). Although open studies in patients with subacute sclerosing panencephalitis showed some immunological indices to vary during long term treatment with inosine pranobex, it is difficult to ascertain whether these were effects of the drug or manifestations of the disease process. Open studies in patients with Hodgkin’s or non-Hodgkin’s lymphoma and several studies in irradiated or post-surgery cancer patients (in which full details were not given) have reported that inosine pranobex may induce positive immunomodulating effects. However, further study is needed in this area. As compared with placebo, inosine pranobex has significantly increased the graft versus host response (an indicator of T-lymphocyte competence) in irradiated or chemotherapy-treated patients with cancer of the stomach, colon and/or rectum.

In male patients with persistent generalised lymphadenopathy, who received inosine pranobex 3 or 4g daily for 28 days, several studies reported an improvement in natural killer cell number and function and some of them also reported a concomitant increase in total T-lymphocytes and helper T-lymphocytes; however, significant immunomodulation in patients with clinically apparent acquired immunodeficiency syndrome (AIDS) has not been reported. Two controlled studies have shown that long term treatment with inosine pranobex is associated with an increased rate of clearance of hepatitis B antigen from the serum of patients with acute hepatitis, and open studies in asymptomatic carriers and patients with chronic aggressive infection suggest a similar effect. In patients with autoimmune disease (alopecia totalis, universalis or areata, rheumatoid arthritis or aphthous stomatitis), small open studies intimate some positive inosine pranobex immunomodulating effects, but further study is needed.

The mechanism of action of inosine pranobex remains unknown. However, the drug may act to restore depressed T-lymphocyte function to normal by increasing lymphokine (interleukin-1 and -2) elaboration, or alternatively by increasing cell ribosomal RNA and protein synthesis while simultaneously inhibiting the use of cell ribosomal RNA for viral replication.

Pharmacokinetics: Following a single oral dose of inosine pranobex, peak plasma concentrations of inosine occur after 1 hour. However, 2 hours after administration, plasma concentrations decrease to undetectable amounts. Inosine pranobex has a very short plasma half-life of 50 minutes following an oral dose. The major excretion product of the inosine moiety is uric acid, while the p-acetamido-benzoic acid and N-N dimethylamino-2-propranol components are excreted in the urine as glucuronidated and oxidised products, respectively, as well as being excreted unchanged.

Therapeutic Trials: In therapeutic trials the usual daily oral dosage of inosine pranobex was 25 to 100 mg/kg or 3 to 6g divided into 4 to 6 doses.

Double-blind placebo-controlled trials reported encouraging results in the clinical response and a decrease in the number of disease recurrences with the use of inosine pranobex in Herpes simplex labialis and Herpes simplex genitalis. However, conflicting results have also been reported in Herpes simplex genitalis. Similarly, while the drug appeared to be beneficial in the treatment of herpetic keratitis, zoster and varicella, further well-designed studies are needed.

Long term studies in subacute sclerosing panencephalitis, which compared inosine pranobex-treated patients to historical controls, determined that the drug both increased survival and decreased neurological deficiencies. The problems inherent in historically controlled studies, in particular the inability to know and therefore to match treatment and control groups for all relevant variables which might influence the study outcome, indicate the need for caution in interpreting these results.

While inosine pranobex effected symptomatological benefits (vs placebo) in patients with experimentally induced influenza infection, several studies have reported that neither the incidence of illness nor seroconversion was significantly altered. Similarly, 2 double-blind placebo-controlled comparisons in experimentally induced rhinovirus infection reported conflicting results as to the benefits of inosine pranobex therapy.

Preliminary evidence suggests that inosine pranobex may improve some of the clinical symptoms associated with persistent generalised lymphadenopathy in immunodepressed males. However, these results must be interpreted with caution. The combined use of oral inosine pranobex plus conventional non-surgical treatment of genital warts resulted in greatly increased cure rates versus the rates for conventional treatment alone. Confirmation of these highly encouraging results in well-designed comparative studies will be awaited with interest.

A double-blind placebo-controlled study reported a statistically significant beneficial effect of inosine pranobex on liver function tests and some of the symptomatology in patients with acute type B viral hepatitis.

Double-blind placebo-controlled studies have also reported statistically significant therapeutic benefits with the use of inosine pranobex in tropical, but not ordinary, measles. Similarly, the infection frequency and duration (respiratory and/or urinary tract) in elderly institutionalised, seriously ill or surgical patients was significantly reduced after long term (3 months) therapy with the drug. Furthermore, open studies and case reports suggest possible therapeutic benefits with the use of inosine pranobex in other infectious diseases, and in alopecia, rheumatoid arthritis and other autoimmune disorders. Patients with amyotrophic lateral sclerosis given inosine pranobex for 3 to 6 months, and patients with progressive rubella panencephalitis, have not been reported to derive significant therapeutic benefit from the drug.

Side Effects: Inosine pranobex has not produced serious side effects. The only side effects associated with inosine pranobex therapy to date have been transient increases in serum and urinary uric acid concentrations and occasional transient nausea associated with the large number of tablets ingested.

Dosage and Administration: The recommended adult oral dosage of inosine pranobex is 1g 4 times daily. In children the usual dosage is 50 mg/kg per day given in divided doses throughout the waking hours.

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  1. ADIS Drug Information Services, Centorian Drive, Private Bag, Mairangi Bay, Auckland 10, New Zealand

    Deborah M. Campoli-Richards, Eugene M. Sorkin & Rennie C. Heel

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  1. Deborah M. Campoli-Richards
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  2. Eugene M. Sorkin
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  3. Rennie C. Heel
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Various sections of the manuscript reviewed by: M. Altes, Department of Neurology, Temple University Hospital, Philadelphia, Pennsylvania, USA; J.G. Bekesi, Department of Neoplastic Diseases, Mount Sinai Medical Center, New York, New York, USA; T.-W. Chang, Infectious Diseases Service, Tufts University School of Medicine, Boston, Massachusetts, USA; E. De Clercq, Rega Institut, Katholieke Universiteit, Leuven, Belgium; G.J. Galasso, Department of Health and Human Services, National Institutes of Health, Bethesda, Maryland, USA; R.B. Herberman, Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania, USA; A. Pompidou, Laboratoire Central d’Anatomie Pathologique Cytologie-Cytogénétique, Hôpital Saint-Vincent-de-Paul, Paris, France; P.G. Reizenstein, Division of Hematology, Karolinska Hospital, Stockholm, Sweden; E. Sandström, Department of Dermatology, Sodersjukhuset, Stockholm, Sweden; J.-L. Touraine, Professeur Agrégé, Hôpitaux de Lyon, Lyon, France.

‘Delimmun’ (Delalande); ‘Immunoviral’ (Instituto Luso-Farmaco); ‘Imunovir’ (Burgess; Newport); ‘Isoprinosin’ (Andreu); ‘Isoprinosina’ (Delalande); ‘Isoprinosine’ (Delalande, Fisons, Leclerc, Roussel, P.T. Indexim, Marsman, Merrell, Newport); ‘Modimmunal’ (Ravizza); ‘Prinosine’ (Chong Kun Dang); ‘Viruxan’ (Gramon, Sigma Tau); ‘Viruxprine’ (Faes).

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Campoli-Richards, D.M., Sorkin, E.M. & Heel, R.C. Inosine Pranobex. Drugs 32, 383–424 (1986). https://doi.org/10.2165/00003495-198632050-00001

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