A new prescription would need clarification if which of the following were omitted?

While contraindications are important for patient safety, they typically provide warnings about when a medication should not be used due to potential harm. Omitting contraindications would certainly require clarification, but the prescription would still be usable as it could be adjusted based on patient history, making it less critical than dosing frequency.

Therapeutic substitutions involve replacing a prescribed medication with a different, but chemically similar, drug that has the same therapeutic effect. While important in specific contexts, the omission of this information does not directly affect the administration of the prescribed medication itself, as it pertains more to alternatives rather than the actual prescription.

Side effects are important for informing the patient about potential adverse reactions to the medication. However, even if this information is omitted, patients can still take the medication as prescribed. They can be educated about side effects once the prescription is clarified, which does not impede the immediate use of the medication.