A nurse is preparing to administer benztropine mesylate 2 mg IM to a client who has schizophrenia and is experiencing an extrapyramidal reaction to antipsychotic medication. Available is benztropine mesylate injection 1 mg/mL in 2 mL ampules. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)