overdose

n. excessive dose of medication or drugs

v. take an exaggerated amount of medicine or drugs; prescribe an excessive amount of medicine or drugs

The term drug overdose (or simply overdose or OD) describes the ingestion or application of a drug or other substance in quantities greater than are recommended or generally practiced. An overdose is widely considered harmful and dangerous as it can result in death.
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Overdose /over·dose/ 1. to administer an excessive dose. 2. an excessive dose. o·ver·dose n. An excessive dose, especially of a narcotic. [more]Overdose - Community and Resources

Verb
1. dose too heavily; "The rock star overdosed and was found dead in his hotel room"
(synonym) o.d.
(hypernym) drug, dose

n. overdosage, dosage which is excessive