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Drops are a common vehicle for administering drugs to the eye, but they must be instilled correctly. To limit wastage and systemic absorption a single drop should usually be prescribed. If the patient needs to use two types of drop their instillation should be separated by at least three minutes. Most eye drops contain a preservative, but they should not be kept beyond the expiry date on the label.
11.16 Vehicles, delivery systems, pharmacokinetics, formulation (Part of: 11 Medical treatment)