Hi, Ondem contains ondansetron which is used to prevent your baby from nausea and vomiting. It is known as an antiemetic drug and is also used to prevent nausea and vomiting due to any causes. It is a safe medicine for babies if it is used according to the doctor s advice. Rantac syrup contains ranitidine which is used to reduce the amount of excess acid make by the stomach. It is used to treat and prevent indigestion and other symptoms caused by too much acid in the stomach. It is usually considered effective and safe medication for the babies if this medication has been prescribed by a doctor. Wikoryl AF syrup contains both chlorpheniramine maleate and phenylephrine which is used to treat common cold symptoms. It relieves allergy sump like runny nose, stuffy nose, sneezing, watery eyes and congestion or stuffiness. It is a safe medication for babies if it is taken or given as advised by the doctor. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician