Recombivax HB 10mcg/1.0 mL is indicated for active immunisation against hepatitis B virus infection caused by all known subtypes in individuals 16 years of age or more considered at risk of exposure to hepatitis B virus.

The specific at risk categories to be immunised are to be determined on the basis of the official recommendations.

It can be expected that hepatitis D will also be prevented by immunisation with Recombivax HB  as hepatitis D (caused by the delta agent) does not occur in the absence of hepatitis B infection.

Posology

Recombivax HB 10mcg/1.0 mL^:  Individuals 16 years of age or more: 1 dose (1 ml) at each injection

Primary vaccination:

A course of vaccination should include at least three injections.

Two primary immunisation schedules can be recommended:

0, 1, 6 months: two injections with an interval of one month; a third injection 6 months after the first administration.

0, 1, 2, 12 months: three injections with an interval of one month; a fourth dose should be administered at 12 months.

It is recommended that the vaccine be administered in the schedules indicated. Those receiving the compressed regimen (0, 1, 2 months dosing schedule) must receive the 12 month booster to induce higher antibody titres.

Booster:

Immunocompetent vaccinees

The need for a booster dose in healthy individuals who have received a full primary vaccination course has not been established. However, some local vaccination schedules currently include a recommendation for a booster dose and these should be respected.

Immunocompromised vaccinees (e.g. dialysis patients, transplant patients, AIDS Patients)

In vaccinees with an impaired immune system, administration of additional doses of vaccine should be considered if the antibody level against hepatitis B virus surface antigen (anti-HBsAg) is less than 10 IU/l.

Revaccination of nonresponders

When persons who do not respond to the primary vaccine series are revaccinated, 15-25 % produce an adequate antibody response after one additional dose and 30-50 % after three additional doses. However, because data are insufficient concerning the safety of hepatitis B vaccine when additional doses in excess of the recommended series are administered, revaccination following completion of the primary series is not routinely recommended. Revaccination should be considered for high-risk individuals, after weighing the benefits of vaccination against the potential risk of experiencing increased local or systemic adverse reactions.

Special dosage recommendations for known or presumed exposure to hepatitis B virus (e.g. needlestick with contaminated needle):

-                 Hepatitis B immunoglobulin should be given as soon as possible after exposure (within 24 hours).

-                 The first dose of the vaccine should be given within 7 days of exposure and can be administered simultaneously with hepatitis B immunoglobulin, but at a separate injection site.

-                 Serologic testing is also recommended, with the administration of subsequent doses of vaccine, if necessary, (i.e. according to the serologic status of the patient) for short and long term protection.

-                 In the case of unvaccinated or incompletely vaccinated individuals, additional doses should be given as in the recommended immunisation schedule. The accelerated schedule including the 12 month booster dose can be proposed.

Individuals less than 16 years of age:

Recombivax HB 10mcg/1.0 mL is not indicated in this subset of paediatric population.

The appropriate strength for administration to individuals from birth through 15 years of age is Recombivax HB 5mcg/0.5 mL.

Method of administration

This vaccine should be administered intramuscularly.

The deltoid muscle is the preferred site for injection in adults and adolescents.

Do not inject intravascularly.

Exceptionally, the vaccine may be administered subcutaneously in patients with thrombocytopaenia or bleeding disorders.

Precautions to be taken before handling or administering the product: see section 6.6.

Traceability

In order to improve the traceability of biological medicinal products, the name and the batch number of the administered product should be clearly recorded.

As with all injectable vaccines, appropriate medical treatment should always be readily available in case of rare anaphylactic reactions following the administration of the vaccine (see section 4.8).

This vaccine may contain traces of formaldehyde and potassium thiocyanate which are used during the manufacturing process. Therefore, hypersensitivity reactions may occur (see sections 2 and 4.8).

Use caution when vaccinating latex-sensitive individuals since the vial stopper contains dry natural latex rubber that may cause allergic reactions.

For clinical or laboratory monitoring regarding immunocompromised individuals or individuals with known or presumed exposure to hepatitis B virus, see section 4.2.

A number of factors have been observed to reduce the immune response to hepatitis B vaccines. These factors include older age, male gender, obesity, smoking, route of administration and some chronic underlying diseases. Consideration should be given to serological testing of those subjects who may be at risk of not achieving seroprotection following a complete course of Recombivax HB. Additional doses may need to be considered for persons who do not respond or have a sub-optimal response to a course of vaccinations.

Because of the long incubation period of hepatitis B, it is possible for unrecognised hepatitis B infection to be present at the time of vaccination. The vaccine may not prevent hepatitis B infection in such cases.

The vaccine will not prevent infection caused by other agents such as hepatitis A, hepatitis C and hepatitis E and other pathogens known to infect the liver.

Caution should be exercised when prescribing to pregnant or breast-feeding women (see section 4.6).

Excipient(s) with known effect:

This medicinal product contains less than 1mmol sodium (23 mg) per dose, and is considered to be essentially sodium free.

This vaccine can be administered:

-        with hepatitis B immunoglobulin, at a separate injection site.

-        to complete a primary immunisation course or as a booster dose in subjects who have previously received another hepatitis B vaccine.

-        concomitantly with other vaccines, using separate sites and syringes.

Fertility:

Recombivax HB has not been evaluated in fertility studies.

Pregnancy:

There is no clinical data on the use of Recombivax HB on pregnant women.

The vaccine should be used during pregnancy only if the potential benefit justifies the potential risk to the foetus.

Breast-feeding:

There is no clinical data on the use of Recombivax HB on breast-feeding women.

No studies on the effects on the ability to drive and use machines have been performed. However, Recombivax HB is expected to have no or negligible influence on the ability to drive and use machines.

a. Summary of the safety profile

The most common side effects seen are injection-site reactions: transient soreness, erythema, induration.

b. Tabulated summary of adverse reactions

The following undesirable effects have been reported following the widespread use of the vaccine.

As with other hepatitis B vaccines, in many instances, the causal relationship to the vaccine has not been established.

Post-marketing Experience:

·         Eye disorders: tinnitus; conjunctivitis; visual disturbances

·         Nervous System Disorders: radiculopathy; herpes zoster; migraine; muscle weakness; hypesthesia

·         Skin and Subcutaneous Disorders: Stevens-Johnson syndrome

·         Cardiac Disorders: tachycardia

·         Psychiatric Disorders: irritability; agitation; somnolence

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions

To report any side effect(s):

·       Saudi Arabia:

The National Pharmacovigilance Centre (NPC):

SFDA Call Center: 19999

E-mail: npc.drug@sfda.gov.sa

Website: https://ade.sfda.gov.sa

·       Other GCC States:

Please contact the relevant competent authority.

There have been reports of administration of higher than recommended doses of Recombivax HB.

In general, the adverse event profile reported with overdose was comparable to that observed with the recommended dose of Recombivax HB.

Pharmacotherapeutic group: anti-infectious, ATC code: J07BC01

The vaccine induces specific humoral antibodies against hepatitis B virus surface antigen (anti-HBsAg). Development of an antibody titre against hepatitis B virus surface antigen (anti-HBsAg) equal to or greater than 10 IU/l measured 1 to 2 months after the last injection correlates with protection to hepatitis B virus infection.

In clinical trials, 96 % of 1,497 healthy infants, children, adolescents and adults given a 3 dose course of a previous formulation of Merck’s recombinant hepatitis B vaccine developed a protective level of antibodies against hepatitis B virus surface antigen (³ 10 IU/l). In two trials conducted in older adolescents and adults, 95.6-97.5 % of vaccinees developed a protective level of antibodies, with geometric mean titres in these trials ranging from 535 – 793 IU/l.

Although the duration of the protective effect of a previous formulation of Merck’s recombinant hepatitis B vaccine in healthy vaccinees is unknown, follow-up over 5-9 years of approximately 3,000 high-risk subjects given a similar plasma-derived vaccine has revealed no cases of clinically apparent hepatitis B infection.

In addition, persistence of vaccine-induced immunologic memory for hepatitis B virus surface antigen (HBsAg) has been demonstrated through an anamnestic antibody response to a booster dose of a previous formulation of Merck’s recombinant hepatitis B vaccine in healthy adults. The duration of the protective effect in healthy vaccinees is unknown. The need for a booster dose of Recombivax HB is not yet defined beyond the 12 month booster dose required for the 0, 1, 2 compressed schedule.

Reduced risk of Hepatocellular Carcinoma

Hepatocellular carcinoma is a serious complication of hepatitis B virus infection. Studies have demonstrated the link between chronic hepatitis B infection and hepatocellular carcinoma and 80 % of hepatocellular carcinomas are caused by hepatitis B virus infection. Hepatitis B vaccine has been recognised as the first anti-cancer vaccine because it can prevent primary liver cancer.

Not applicable.

Animal reproduction studies have not been conducted.

·         Sodium Chloride : 9.0 mg (10mcg/1.0mL) 

·         Sodium Borate: 70 mcg (10mcg/1.0mL) 

·         Water for injection: to 1.0 ml (10mcg/1.0mL)

In the absence of compatibility studies, this medicinal product must not be mixed with other medicinal products.

Store in a refrigerator (2 °C – 8 °C).

Do not freeze. Store in the original package in order to protect from light.

Recombivax HB should be administered as soon as possible after being removed from refrigeration. Recombivax HB can be administered provided total (cumulative multiple excursion) time out of refrigeration (at temperatures between 8°C and 25°C) does not exceed 72 hours. Cumulative multiple excursions between 0°C and 2°C are also permitted as long as the total time between 0°C and 2°C does not exceed 72 hours. These are not, however, recommendations for storage.

1 ml of suspension in vial (glass) with stopper (gray butyl rubber) and aluminum seals with plastic flip caps. Pack size of 1.

The vaccine should be inspected visually in order to detect any appearance of precipitate or discolouring of the content prior to administration. If these conditions exist, the product should not be administered.

Before use, the vial should be well shaken.

Once the vial has been penetrated, the withdrawn vaccine should be used promptly, and the vial must be discarded.

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.