Patient-controlled analgesia can be administered via all of the following routes EXCEPT

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Patient-controlled analgesia (PCA) allows patients to manage their pain by self-administering doses of analgesics. It is commonly used via routes such as transdermal, epidural, and intravenous (both peripheral and central veins). Inhalation is not a standard route for PCA because it is difficult to control and monitor the dosage accurately.

Patient-Controlled Analgesia Can Be Administered Via All of the Following