Before taking Vermox, patients should talk to their doctor about their allergies, health conditions, pregnancy status, breastfeeding status, and any medications they take., Vermox may cause convulsions in patients younger than one years old., Vermox may cause abnormal blood counts in patients who take more than the recommended dose or in patients who take it longer than recommended., Taking Vermox with metronidazole can lead to severe skin reactions known as Stevens-Johnson syndrome and toxic epidermal necrolysis. Avoid taking these medications simultaneously.