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However, for those living with coeliac disease, when gluten is eaten it causes damage to the lining of the small bowel because the body ends up attacking its own cells

Other reactions warranting urgent GP contact include: Unexplained muscle weakness or cramping Persistent vomiting or severe abdominal pain Signs of hypokalaemia (low potassium) during initial treatmentmuscle weakness, irregular heartbeat, or severe fatigue In patients with severe, longstanding B12 deficiency, rapid correction can occasionally precipitate hypokalaemia as new red blood cells are produced, consuming available potassium

While this reaction is entirely normal, it can cause mild discomfort for a few days

It is commonly prescribed for infertility, male hypogonadism and undescended testicles