Naso B12 Nasal Spray should be used as you have been advised by your doctor. Do not use it more often or for longer than recommended. Normally you should blow your nose gently before using it, keep one nostril closed while applying the medicine into the other, and then sniff hard to make sure it reaches deep into the nose. Then repeat for the other nostril.
It is generally safe with little or no side effects. However, it may cause mild nasal discomfort in some people. Consult your doctor if they persist or if you are bothered by it.
Before using the medicine, let your doctor know if you have used a similar medicine before and had an allergic reaction. Before starting to use this medicine you should let your doctor know if you are pregnant or breastfeeding, discuss the risks and benefits with your doctor to make sure it is safe for you.