Medicines that you can buy at the pharmacy or even the supermarket without a prescription are still medicines and should be kept out of reach of children and used as directed on the package. If symptoms persist you should consult your doctor.
These medicines are not restricted to prescription only but there is still potential of side effects. This page has links to the information you need to know about non prescription medicines.
Paracetemol
Ibuprofen
Benadryl
Codral