First, keep it calm and quiet to help keep it from going into shock. Call your veterinarian for further instructions, but you should take your bird in as soon as possible. If you know the poison product, take it with you. If you cannot reach your veterinarian, call the Poison Control Center in your area immediately. I can never tell if my bird is well or not.
Birds are experts at hiding illnesses.
This is a method of survival in the wild and even though your bird is tame, this instinct is still present. You may need to do some detective work to observe symptoms. If any of the above symptoms are observed, isolate your bird and call or transport for vet care as soon as possible. A friend of mine said that birds can bleed to death easily. I've never heard of this, though I guess it's possible.