Also discard any medication if you can no longer read its label. Never mix different medications in the same container. Use child-resistant caps on all medicine containers. Keep medications locked up in a cabinet. Some non-prescription medicines that indeed do taste good are dangerous when taken in large quantities.
Some examples are aspirin and vitamin pills with iron.
If you need your glasses to read, make sure you have them on when taking medicine. This way you can be sure you have the right medicine. For the same reason, be sure to turn on the light when taking medicine at night. If you think that a particular medicine is not working, contact your healthcare provider right away. Also let him or her know if it makes you feel funny, or if it is causing an unexpected or unpleasant side effect.