Make sure your doctor knows if you are pregnant or breastfeeding, or if you have had an allergic reaction to hydroxocobalamin or cyanocobalamin.
This medicine may cause skin redness and make your skin more sensitive to sunlight. This effect may last for up to 2 weeks after you have received this medicine. Avoid being under the sun while your skin is red. Use a sunscreen when you are outdoors. Avoid sunlamps and tanning beds.