The nurse is providing discharge instructions to a client who has been prescribed gabapentin 300 mg by mouth (PO) three times a day for postherpetic neuralgia. Which symptom should the nurse tell the client to report to the healthcare provider?

A. Gastric irritation: Gastric irritation is not a common side effect of gabapentin. While gastrointestinal symptoms can occur, they are not typically severe or indicative of a serious issue. Thus, this symptom is less critical to report immediately. B. Rapid weight gain: Rapid weight gain can be a significant side effect of gabapentin, potentially indicating fluid retention or other systemic issues. It is important to report this symptom, as it may require further evaluation and adjustment of the medication. C. Sexual dysfunction: Sexual dysfunction is not commonly reported with gabapentin. While it may affect some individuals, it is not typically a primary concern for discontinuing or altering treatment. Therefore, it is less urgent compared to other side effects. D. Photosensitivity: Photosensitivity is not a recognized side effect of gabapentin. The medication does not generally cause sensitivity to light, so this symptom is unlikely to be related to gabapentin use and is less critical to report immediately.