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. Rapid weight gain: Gabapentin is not typically associated with rapid weight gain as a common side effect. However, significant and rapid weight gain can be a concern, as it may indicate fluid retention or other underlying issues that need to be addressed by the healthcare provider. Prompt reporting of such symptoms ensures appropriate evaluation and management. B. Photosensitivity: Photosensitivity is not a known side effect of gabapentin. While skin reactions can occur with some medications, photosensitivity is not a common issue with gabapentin. The client should be advised to report unusual skin reactions, but photosensitivity is not a specific concern for gabapentin. C. Gastric irritation: Gastric irritation is not a common side effect of gabapentin. Gabapentin is generally well-tolerated and does not frequently cause gastric problems. If the client experiences significant gastric issues, it should be reported, but it is not a primary concern for this medication. D. Sexual dysfunction: While sexual dysfunction is not a widely recognized side effect of gabapentin, it can be a concern for some patients. However, rapid weight gain is a more immediate and significant symptom that should be reported to the healthcare provider for further investigation.