Hi M.,
I've had great experience using Hylands cell salts for many issues in addition to teething. The ones designed for cold/runny nose work very well also. Since they are homeopathic, they do not interact with any other medicine. They are best given in a "clean mouth" which means no food or drink except water in the last 15 mins. In an older child, place the tabs under the tongue, where they are introduced fastest into the bloodstream. The tabs are tiny, dissolve quickly and have a neutral taste.
I know of no bad experience with these tabs.
Hylands also work great for adults with nervous tension headache, overeating, poor digestion, simple cold. I've used them for 30 yrs. and last gave them to my 86yr old mother for stomach upset and dehydration by aiding balance of electrolytes. HTH.
Peace, C.