Do not use: if you have kidney disease, if you have ever had an allergic reaction to this product or any of its ingredients or to an antihistamine containing cetirizine. Stop use and ask a doctor if: you have trouble urinating or emptying your bladder, an allergic reaction to this product occurs. Seek medical help right away. If pregnant or breast-feeding: if breast-feeding: not recommended, if pregnant: ask a health professional before use, keep out of reach of children. In case of overdose, get medical help or contact a poison control center right away (1-800-222-1222). When using this product: drowsiness may occur, avoid alcoholic drinks, alcohol, sedatives, and tranquilizers may increase drowsiness, be careful when driving a motor vehicle or operating machinery. Ask a doctor before use if you have: ever had trouble urinating or emptying your bladder.