Knolcold Drops is commonly prescribed in children to treat common cold symptoms like sore throat, runny nose, cough, sneezing, watery eyes, body ache, and fever. Give Knolcold Drops at a fixed time each day so that it gradually make a place in your child’s daily routine. Common side effects include nausea, vomiting, and headache, which are temporary and usually resolve over time. It may cause dizziness and sleepiness, so avoid driving or mental focus.