It can depend on the type of weight loss treatment you’re using, but the most common side effects are flatulence, increased and sudden bowel movements, fatty or oily stools, diarrhoea, constipation, headache and feeling sick.
Not everyone experiences these symptoms, but if you do, they normally occur shortly after eating a meal that’s high in fat. They’re a lot less likely to occur if you reduce the number of fatty meals you consume, and side effects tend to ease once your body has become accustomed to the treatment.
Severe side effects are rare with weight loss products, but if you experience any signs of an allergic reaction (such as serious breathing difficulties, rash, itching, sweating, swelling in the face and throat, increased heart rate, nausea and vomiting) you should stop taking the treatment and seek emergency medical attention immediately.
There have been reports of suicidal thoughts, suicide attempts and depression amongst patients whilst using Mysimba. If you experience any thoughts of self-harm or other thoughts which cause you distress, or if you are feeling depressed, contact your clinician or go to hospital straight away.
Although uncommon, patients using Saxenda have reported experiencing pancreatitis (inflammation of the pancreas). Pancreatitis is a potentially life-threatening condition, and you should go to hospital or get medical attention immediately if you develop severe and persistent abdominal pain which may spread to your back, and nausea and vomiting symptoms.
In the first instance, if you do get any side effects, you should always contact your clinician. They may advise you to try an alternative weight loss product, or to make further adjustments to your diet.