If your 4-year-old accidentally took 2 albendazole tablets, it's essential not to panic. Albendazole is commonly used to treat parasitic infections, and an accidental extra dose is usually not harmful. Side effects like nausea, stomach pain, or headache may occur, but they are typically mild and temporary. Here's what you can do: keep an eye on your child for any unusual symptoms and give plenty of fluids. If you notice anything concerning, don't hesitate to contact your pediatrician or a poison control center for further guidance. In fact, your child will likely be just fine, but it's always good to be cautious in such situations.