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Like all medicines, this medicine can cause side effects, although not everybody gets them.
Allergic reactions: Urgent medical advice or treatment may be needed in case of any signs of allergic reactions during or after the injection. They include: tight chest or wheezing; feeling short of breath; fever or chills; severe dizziness or light-headedness; swelling of the lips, tongue, face; skin itching, hives or rash.
The next dose should not be taken until instructed/advised.
Injection-related reactions (very common: may affect more than 1 in 10 people): In most cases these are mild reactions, but some can be serious.
Urgent medical advice or treatment may be needed in case of any of these signs during or after the injection, particularly in the first 24 hours after the injection: redness, itching, pain or swelling where the injection is given; rash, red or itchy skin or hives; feeling flushed; headache; throat irritation, swelling or pain; feeling short of breath; low blood pressure (dizziness and light-headedness); fever or chills; feeling tired; feeling or being sick, or diarrhoea; fast heart rate, fluttering or pounding heart (palpitations).
Other side effects: Very common (may affect more than 1 in 10 people): headache; joint pain; high levels of blood lipids (fats); low level of white blood cells in tests.
Common (may affect up to 1 in 10 people): feeling stiff; migraine; slow heart beat (bradycardia); increase in blood pressure; being unable to sleep; swelling in the lower legs, feet or hands; rash or itching; allergies or hay fever; stomach inflammation (gastritis), including stomach pain and nausea; weight increase; blood tests showing: low fibrinogen levels (a protein involved in blood clotting), high level of liver enzymes (transaminases, possible sign of liver problems), high level of bilirubin (possible sign of liver problems), low level of platelets (which may lead to bleeding or bruising easily).
