Homeopathic medicines are energy. They are prepared by extreme dilutions. This eliminates the dangers and hence, no side effects. But still large overdose of homoeopathic medicine than what is being prescribed by the physician can result in little difficulty.
Homeopathic medicines do not produce side affects as normally associated with allopathic medicine, what one can experience after an homeopathic prescription is what is called the healing reaction or affect. This is often experienced as a brief return of old symptoms. What is in fact taking place is a clearing of energetic information at a cell level, giving the sensation of experiencing the symptoms of the chronic disease that was suppressed.