Clinical Trials Experience
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a vaccine cannot be directly compared to rates in the clinical trials of another vaccine and may not reflect the rates observed in practice. As with any vaccine, there is the possibility that broad use of TWINRIX could reveal adverse events not observed in clinical trials.
Following any dose of TWINRIX, the most common ( ≥ 10%) solicited injection site reactions were injection site soreness (35% to 41%) and redness (8% to 11%); the most common solicited systemic adverse events were headache (13% to 22%) and fatigue (11% to 14%).
The safety of TWINRIX has been evaluated in clinical trials involving the administration of approximately 7,500 doses to more than 2,500 individuals.
In a US study, 773 subjects (18 to 70 years of age) were randomized 1:1 to receive TWINRIX (0-, 1-, and 6-month schedule) or concurrent administration of ENGERIX-B (0-, 1-, and 6-month schedule) and HAVRIX (0- and 6-month schedule). Solicited local adverse reactions and systemic adverse events were recorded by parents/guardians on diary cards for 4 days (days 0 to 3) after vaccination. Unsolicited adverse events were recorded for 31 days after vaccination. Solicited events reported following the administration of TWINRIX or ENGERIX-B and HAVRIX are presented in Table 1.
Table 1: Rates of Local Adverse
Reactions and Systemic Adverse Events Within 4 Days of With or ENGERIX-B and
|Dose 1||Dose 2||Dose 3||Dose 1||Dose 2||Dose 3||Dose 1||Dose 2|
|(N = 385) %||(N = 382) %||(N = 374) %||(N = 382) %||(N = 376) %||(N = 369) %||(N= 382) %||(N = 369) %|
|Systemic||TWINRIX||ENGERIX-B and HAVRIX|
|Dose 1||Dose 2||Dose 3||Dose||Dose||Dose|
|(N = 385) %||(N = 382) %||(N = 374) %||(N = 382) %||(N = 376) %||(N= 369) %|
|aWithin 4 days of vaccination defined as day
of vaccination and the next 3 days.
b389 subjects received at least 1 dose of TWINRIX.
c384 subjects received at least 1 dose each of ENGERIX-B and HAVRIX.
dDoses 1 and 3 included ENGERIX-B and HAVRIX in the control group receiving separate vaccinations.
eDose 2 included only ENGERIX-B in the control group receiving separate vaccinations.
Most solicited local adverse reactions and systemic adverse events seen with TWINRIX were considered by the subjects as mild and self-limiting and did not last more than 48 hours.
In a clinical trial in which TWINRIX was given on a 0-, 7-, and 21- to 30-day schedule followed by a booster dose at 12 months, solicited local adverse reactions or systemic adverse events were comparable to those seen in other clinical trials of TWINRIX given on a 0-, 1-, and 6-month schedule.
Among 2,299 subjects in 14 clinical trials, the following adverse events were reported to occur within 30 days following vaccination:
Incidence 1% to 10% of Injections, Seen in Clinical Trials With TWINRIX
Infections and Infestations: Upper respiratory tract infections.
General Disorders and Administration Site Conditions: Injection site induration.
Incidence < 1% of Injections, Seen in Clinical Trials With TWINRIX
Infections and Infestations: Respiratory tract illnesses.
Metabolism and Nutrition Disorders: Anorexia.
Psychiatric Disorders: Agitation, insomnia.
Ear and Labyrinth Disorders: Vertigo.
Vascular Disorders: Flushing.
Gastrointestinal Disorders: Abdominal pain, vomiting.
Incidence < 1% of Injections, Seen in Clinical Trials With HAVRIX and/or ENGERIX-B:
Blood and Lymphatic System Disorders: Lymphadenopathy.a+b
Nervous System Disorders: Dysgeusia,a hypertonia,atingling.b
Eye Disorders: Photophobia.a
Vascular Disorders: Hypotension.b
Gastrointestinal Disorders: Constipation.b
Investigations: Creatine phosphokinase increased.a
a+b Following either HAVRIX or ENGERIX-B.
a Following HAVRIX.
b Following ENGERIX-B.
Adverse events within 30 days of vaccination in the US clinical trial of TWINRIX given on a 0-, 7-, and 21- to 30-day schedule followed by a booster dose at 12 months were comparable to those reported in other clinical trials.
The following adverse events have been identified during postapproval use of TWINRIX, HAVRIX, or ENGERIX-B. Because these events are reported voluntarily from a population of uncertain size, it is not possible to reliably estimate their frequency or establish a causal relationship to product exposure.
Experience with TWINRIX
The following list includes serious events or events which have suspected causal connection to components of TWINRIX.
Blood and Lymphatic System Disorders: Thrombocytopenia, thrombocytopenic purpura.
Immune System Disorders: Allergic reaction, anaphylactoid reaction, anaphylaxis, serum sickness–like syndrome days to weeks after vaccination (including arthralgia/arthritis, usually transient, fever, urticaria, erythema multiforme, ecchymoses, and erythema nodosum).
Nervous System Disorders: Bell's palsy, convulsions, encephalitis, encephalopathy, Guillain-Barré syndrome, hypoesthesia, myelitis, multiple sclerosis, neuritis, neuropathy, optic neuritis, paralysis, paresis, transverse myelitis.
Eye Disorders: Conjunctivitis, visual disturbances.
Vascular Disorders: Vasculitis.
Gastrointestinal Disorders: Dyspepsia.
Musculoskeletal and Connective Tissue Disorders: Arthritis, muscular weakness.
General Disorders and Administration Site Conditions: Chills, immediate injection site pain, stinging, and burning sensation, injection site reaction, malaise.
Investigations: Abnormal liver function tests.
Experience With HAVRIX and/or ENGERIX-B
The following list includes serious events or events which have suspected causal connection to components of HAVRIX and/or ENGERIX-B, not already reported above for TWINRIX.
Eye Disorders: Keratitis.b
Skin and Subcutaneous Tissue Disorders: Stevens-Johnson syndrome.b
Congenital, Familial and Genetic Disorders: Congenital abnormality.a
a Following HAVRIX.
b Following ENGERIX-B.
Read the Twinrix (hepatitis a inactivated & hepatitis b (recombinant) vaccine) Side Effects Center for a complete guide to possible side effects
Concomitant Administration With Vaccines And Immune Globulin
Do not mix TWINRIX with any other vaccine or product in the same syringe or vial.
When concomitant administration of immunoglobulin is required, it should be given with a different syringe and at a different injection site.
There are no data to assess the concomitant use of TWINRIX with other vaccines.
Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs, and corticosteroids (used in greater than physiologic doses), may reduce the immune response to TWINRIX.
Read the Twinrix Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 11/2/2015
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