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) Photosensitivity: While photosensitivity can occur with some medications, it is not a common side effect of gabapentin. Therefore, it may not be the most critical symptom to report. B) Gastric Irritation: Gastric irritation can occur with many medications, but it is typically not a significant concern with gabapentin. The client should monitor for this but it isn't as urgent as other symptoms. C) Sexual dysfunction: While sexual dysfunction can occur as a side effect of some medications, it is not specifically associated with gabapentin, and it is not an immediate concern. D) Rapid weight gain: Rapid weight gain can indicate fluid retention or other serious complications, which could require urgent evaluation and intervention. Therefore, the client should be instructed to report any significant or rapid changes in weight to the healthcare provider.