Hello Marilyn , I am Dr. Arun and will be helping you today.He may experience some side effects as following;SleepinessNauseaDiarrheaHeadacheDizzinessDry mouthFatigueSweatingPalpitationsMuscle painTremorsVomitingImpairment of cognitive/motor functions Low sodiumMany times none of these side effects may happen with a single high dose. But in people above 65 years; usually monitoring for these symptoms should be done. The above symptoms can be of varying intensity. If any of them is severe, he may need a medical attention.Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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