As with any prescription medication, Champix can cause some side effects. Most of these are not serious and may not affect everyone who takes this medication. It can be difficult to correctly attribute some side effects as stopping smoking can cause various symptoms, whether or not you are taking Champix. These symptoms may include changes of mood (like feeling depressed, irritable or anxious), insomnia, difficulty concentrating, decreased heart rate and increased appetite.
The common side effects of Champix include nausea, headache, insomnia, abnormal dreams, fatigue, indigestion and flatulence. Nausea and sleep-related side effects can be lessened by taking the tablets with a glass of water after a meal, preferably not right before bedtime.
Uncommon side effects include chest pain, fever, cough, appetite loss and disturbed vision.
Serious allergic reactions to Champix are very rare, but can occur. If you notice any symptoms of this – rashes, hives, itching, swelling, tingling, blistering, difficulty breathing or severe dizziness – stop taking the medication and contact your doctor immediately.
Certain pre-existing conditions can increase your risk for some side effects. In people with existing cardiovascular disease (i.e. diseases of the heart or blood vessels), Champix has been connected to new or worsened cardiovascular problems and cardiovascular events such as stroke and heart attack. It is advisable to report any new or worsening cardiovascular symptoms to your doctor.
Champix has also been connected to an increased risk of depression, suicidal ideation, hostility and agitation, particularly in those who have a history of psychiatric illness. Pay close attention to your mood while taking this medicine, and contact your doctor if you are concerned.
It's important to remember that you are unlikely to suffer from any of these side effects while on Champix, and that if you do, they will probably be mild and resolve themselves as your body adjusts to the medicine.
If you experience any severe side effects, or ones that are not mentioned here, please contact your doctor or our patient support team immediately.
Visit our quit smoking blog pages for regular updates on how smoking effects the body and on how to stop smoking for good.
You can buy Champix online at 121doc with free delivery available across the UK. We have a completely discreet packaging and postal service with no mention of products or 121doc. For more information visit our Champix page.
*The medical sources used for this article can be viewed on our legal page.