Rare reported side effect (experienced in more than 1 in 10,000 but less than 1 in 1,000 patients) • Severe allergic reactions to insulins Associated symptoms may include large-scale skin reactions (rash and itching all over the body), severe swelling of skin or mucous membranes (angiooedema), shortness of breath, a fall in blood pressure with rapid heart beat and sweating.These could be symptoms of severe allergic reactions to insulins and may become life-threatening. • Eye reactions A marked change (improvement or worsening) in your blood sugar control can disturb your vision temporarily.