Medicine safety update
Medicines Safety Update
- Jennifer Elijah, Jane Cook
- Aust Prescr 2010;33:168-71
- 1 August 2010
Medicines Safety Update Volume 1, Number 4, August 2010
Medicines Safety Update is the medicines safety bulletin of the Therapeutic Goods Administration (TGA)
Dr Jennifer Elijah, Evaluator, Office of Product Review
The TGA has previously reported Australian experience with varenicline (Champix) up to October 2008.1 In this update, we describe experience with varenicline to May 2010 – in particular, adverse reaction reports of psychiatric symptoms.
Varenicline is available on the Pharmaceutical Benefits Scheme (PBS) as an authority item for people in a comprehensive support and counselling program for smoking cessation. More than 900 000 PBS prescriptions for varenicline have been dispensed since January 2008.
To May 2010 the TGA had received 1025 reports of suspected adverse reactions to varenicline, 691 (67%) of which describe psychiatric symptoms such as depression, agitation, anxiety, altered mood and aggression. There were reports of 206 suicide-related events in people taking varenicline, including 15 completed suicides.
We remind health professionals to discuss these possible adverse effects with patients taking or considering varenicline and their families, and to provide patients with the Consumer Medicines Information leaflet. Health professionals should provide advice to patients and their families about how to recognise and respond to these possible adverse effects.
We ask health professionals to continue to report suspected adverse reactions to varenicline to the TGA. Please include in reports relevant information such as the patient's history of mental illness, concomitant psychotropic medicines and any reactions to previous quit attempts (see box). This information helps us to review cases and make a reasonable assessment of causality – particularly because the association of varenicline and neuropsychiatric symptoms may be confounded by factors such as the effects of nicotine withdrawal, the association of smoking and psychiatric conditions, and the effects of changes in smoking status on blood levels of some antipsychotics.
Dr Jane Cook, Senior Medical Officer, Office of Product Review
The Australian national immunisation program with the non-adjuvant H1N1 vaccine (Panvax and Panvax Junior) began on 30 September 2009. The program was different from other national vaccination programs in several ways, including that it used strategies to stimulate adverse event reporting so that the TGA could closely monitor vaccine safety.
The program was aimed at certain groups at higher risk of exposure to H1N1 (such as healthcare workers) and those vulnerable to more severe outcomes (pregnant women, indigenous people and people with underlying chronic medical conditions) but was promoted and available to all Australians. Immunisation was provided via state and territory immunisation clinics and general practices.
The TGA worked closely with expert committees such as the Australian Technical Advisory Group on Immunisation (ATAGI) and the National Immunisation Committee (a subgroup of the Australian Health Protection Principal Committee) to provide information to health practitioners and consumers on how to report adverse events. The TGA set up a telephone service to take adverse event reports and provided a web reporting tool on its website. Details of both ways to report adverse events and information about managing common, expected adverse effects of vaccination were included in fact sheets and consent forms provided to consumers (Fig. 1).
As the aim of a pandemic program is to immunise a large number of people as efficiently as possible, multi dose vials were used. Multi dose vials are not routinely used in Australia, although they are used in the United States to administer seasonal trivalent influenza vaccine. Information was developed to reassure consumers of the safety of thiomersal, the preservative in the vials, for pregnant women and children. Fact sheets were developed by ATAGI and distributed via the Department of Health and Ageing's Health Emergency website (www.healthemergency.gov.au) and healthcare provider networks.
In the first six months of the program, from 30 September 2009 to 31 March 2010, approximately eight million doses of Panvax and 330 000 doses of Panvax Junior were distributed in Australia. During this period, the TGA received 1614 reports of adverse events associated with H1N1 vaccination.
The highest number of reports was received in October 2009, when there were 696 adverse event reports. By January 2010 numbers had fallen to around 80 reports per month. A second, smaller peak in reporting occurred in March, with 145 reports (Fig. 2). The TGA suspects the second peak was caused by a second wave of promotion of the program by the Department of Health and Ageing, the start of school-based programs in some states and territories, and catch-up reporting following the vacation period.
Most of the 1614 reports received were mild and common problems such as headache, gastrointestinal upset, and injection-site soreness, swelling or redness (Table 1). Most of the adverse effects reported were well recognised and listed in the Product Information for Panvax and Panvax Junior.
|Reaction||Number of cases||% reports containing one or more of these terms|
|Pain (excluding injection-site pain)||388||24%|
|Malaise, lethargy, fatigue, asthenia||360||22%|
|Influenza-like illness, cough, rhinorrhoea, oropharyngeal pain||346||21%|
|Rash (any type), pruritus, urticaria||269||17%|
|Injection-site reaction or injection-site pain||240||15%|
Several neurological adverse events of special interest were closely monitored. One of the concerns raised was a possible association between Guillain-Barré syndrome and vaccination. This concern arose from the observation that in the United States the 1976 influenza vaccine was associated with an excess risk of Guillain-Barré syndrome of nine in every one million vaccinees in the six weeks following vaccination.2 This association has not been seen since. The TGA convened an expert panel to assist in developing case definitions and clinical follow-up templates and to review cases. In total, 10 reports of Guillain-Barré syndrome were received by the TGA in the first six months of the program. This is within the background rate that would be expected for an unvaccinated population.
The occurrence of allergy and anaphylaxis was also closely monitored by the TGA. Anaphylaxis and allergic reactions are not predictable and can occur in anyone regardless of whether they have a history of allergy or not. There were nine cases of anaphylaxis reported and all recovered without sequelae.
There was one case of anaphylaxis reported in a person with a latex allergy who had previously received seasonal trivalent vaccines without any allergic response. The TGA investigated whether latex may have been coming into contact with the vaccine, including commissioning studies in Europe. Investigations showed that latex was not detectable in the vaccine, even when the syringe was damaged or abnormal or the rubber bung of the syringe was crushed.
The number of reports of convulsion associated with H1N1 vaccination is of particular interest. The 2010 seasonal trivalent influenza vaccination program was suspended for children five years and under, following a higher than usual number of reports of febrile convulsion associated with vaccination. In the first six months of the H1N1 vaccination program there were seven reports of febrile convulsion, all of which were in children under five years. Two of these cases occurred in association with varicella vaccine. The Product Information documents for Panvax and Panvax Junior include the occurrence of convulsions as an uncommon event, occurring in 1 in 1000 to 1 in 10 000 cases. More than 300 000 doses of Panvax Junior have been distributed, and so these figures provide reassurance that the non-adjuvant H1N1 vaccine does not produce an excess risk of convulsions in children.
The TGA officially launched a new organisational structure on 1 July 2010. This new structure will support the TGA's delivery of appropriate, consistent, effective and efficient regulation into the future.
Post marketing safety functions for all types of therapeutic products are managed by the Office of Product Review, which is part of the Monitoring and Compliance Group.
The implementation of the new structure is being carefully managed to ensure that current regulatory activities are maintained. The main contact points for reporting suspected reactions to medicines are unchanged, and information for health professionals and consumers – such as alerts, advisories and Medicines Safety Update – will continue to be published as usual.
Detailed information on the new structural arrangements is available at www.tga.gov.au/about/structure-new.htm
|The TGA encourages the reporting of all suspected adverse reactions to medicines, including vaccines, over-the-counter medicines, herbal, traditional or alternative remedies. We particularly request reports of:
||Reports may be submitted:
Medicines Safety Update is aimed at health professionals. It is intended to provide practical information to health professionals on medicine safety, including emerging safety issues. The information in Medicines Safety Update is necessarily general and is not intended to be a substitute for a health professional's judgment in each case, taking into account the individual circumstances of their patients. Reasonable care has been taken to ensure that the information is accurate and complete at the time of publication. The Australian Government gives no warranty that the information in this document is accurate or complete, and shall not be liable for any loss whatsoever due to negligence or otherwise arising from the use of or reliance on this document.
© Commonwealth of Australia 2016.
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Evaluator, Office of Product Review
Senior Medical Officer, Office of Product Review