Dr. Susan Uhrich answered. A 48-year-old member asked: are the side effects of fluoride similar in a way to lithium? However, taking an overdose of fluoride may cause serious problems. Learn more about fluoride side effects. 35 years experience Psychiatry. Sodium fluoride in drinking water or taken as a supplement does not usually cause any side effects. It's uncommon, but you may even have a flouride allergy. The potential side effects of Fluoride and lithium are very different. fluoride rinse side effects. Stop taking this medicine and get emergency help immediately if any of the following effects … Fluoride is a natural mineral that, when added to your oral care, helps prevent cavities. “Fluoride: A Review of Use and Effects on Health,” Journal of the Academy of Medical Sciences of Bosnia and Herzegovina, 2016 “The Effect of 0.2% Sodium Fluoride Mouthwash in … Most states have fluoridated water, which means you should be aware of possible fluoride side effects. PRECAUTIONS: Before using sodium fluoride … The only similarity is that both must be ingested to cause side effects. In a word,: No. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.