Dial 1-800-222-1222 for the Poison Control hotline. No matter where you live, this is the first number to call if you suspect poisoning. The answering party will guide you on what to do next.
As a rule, you should set up your house to reduce the chance of having to call Poison Control. Any medication, even something as common as acetaminophen, can be toxic or fatal for kids if the dose is high enough. Keep the minimum amount of medicines in your home, and put the ones you absolutely can’t live without well out of reach. As for cleaning products, that space under the sink is entirely too accessible for tiny inquisitive people. Keep those harsh chemicals far out of reach, and put a good solid latch or lock on the cabinet where you keep them.