I currently take 1050mg of lithium (tablets) at night. I have been on this dose for years, but in the past 6 months I've been getting terrible headaches, and before I knew about the negative interactions, I would take ibuprofen for the headaches and experience what I now know were side-effects of nausea, irritability, etc. The lithium test is used to measure and monitor the amount of lithium in the blood so that a healthcare practitioner can determine whether the drug blood concentration is within the range that will adequately treat an individual's bipolar disorder (therapeutic range). Acetaminophen belongs to a class of drugs called analgesics. Ibuprofen belongs to the drug class called nonsteroidal anti-inflammatory drugs (NSAIDs). Prescribed Medicines : Prescription medicines are often distinctively shaped and colored to differentiate themselves from other brands or to indicate dosage. Oxycodone may be habit-forming. Take oxycodone exactly as directed. Do not take more of it, take it more often, or take it in a different way than directed by your doctor. Consumer information about the medication BUTALBITAL/ACETAMINOPHEN/CAFFEINE - ORAL (Esgic, Fioricet), includes side effects, drug interactions, recommended dosages, and storage information. Read more about the prescription drug BUTALBITAL/ACETAMINOPHEN/CAFFEINE - ORAL. Oral route (Solution) Hydrocodone bitartrate and acetaminophen oral solution has the potential for addiction, abuse, and misuse, which can lead to overdose and death. Lithium toxicity is another term for a lithium overdose. It occurs when you take too much lithium, a mood-stabilizing medication used to treat bipolar disorder and major depressive disorder. Hydrocodone combination products come as a tablet, a capsule, a syrup, a solution (clear liquid), an extended-release (long-acting) capsule, and an extended-release (long-acting) suspension (liquid) to take by mouth. Acetaminophen is a common pain reliever and fever reducer found in many over-the-counter and prescription medications. Acetaminophen testing is used to help determine if an overdose has occurred and whether an antidote should be given.