Signs and symptoms of over dosage: Prolonged overdose of vitamin B6 i.e. for longer than 2 months and more than 1g per day, may lead to neurotoxic effects.
No cases of overdose with thiamine or cyanocobalamin have been described. Sensorial neuropathy and other sensorial neuropathy syndromes which can be caused by long-term administration of high doses of pyridoxine improve gradually upon vitamin discontinuation.
If the patient notices any unusual symptoms of peripheral sensory neuropathy (sensation of tingling, tickling, prickling, pricking, or burning), tell the doctor immediately.
What to do when the patient had taken more than the recommended dosage: If the patient (or someone else) swallow a lot of tablets at the same time, or a child may have swallowed any, stop taking the product and contact the nearest hospital casualty department or tell the doctor immediately.