Lithobid Controlled-Release and Extended-Release Tablets facts and comparsions at Drugs.com A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Symptoms of toxicity may sometimes occur even with normal doses of Lithobid Controlled-Release and Extended-Release Tablets. Do not exceed the recommended dose. Your doctor should monitor your blood lithium levels routinely to help prevent lithium toxicity. Contact your doctor immediately if you experience symptoms of toxicity such as nausea, diarrhea, vomiting, blurred vision, ringing in the ears, drowsiness, giddiness, muscle weakness, tremor, twitching, seizures, loss of consciousness, loss of coordination, or increased urination.