Although not all of these side effects may occur, if they do occur they may need medical attention. Check with your doctor immediately if any of the following side effects occur while taking hydroxychloroquine: Incidence not known Some side effects of hydroxychloroquine may occur that usually do not need medical attention. Chloroquine fas associated Uses for hydroxychloroquine Can a person eat grapefruit when taking the drug hydroxychloroquine Plaquenil Overdose. Since a Plaquenil hydroxychloroquine overdose can be lethal, it is important to seek medical attention immediately if you think you may have taken too much of the medication. Vision changes, seizures, or cardiac arrest may also occur as a result of taking too much Plaquenil. A 57-year-old female presented to the Ophthalmology clinic at UIHC complaining bilateral central photopsias for the past two years. She suffered from Sjogren syndrome and inflammatory arthritis and was currently treated with prednisone and methotrexate. She was previously treated with hydroxychloroquine Plaquenil 200mg bid 6.5mg/kg for 10 years, which was stopped one year prior to. An overdose of hydroxychloroquine can be fatal, especially in children. Hydroxychloroquine overdose must be treated quickly. You may be told to induce vomiting right away at home, before transport to an emergency room. Ask the poison control center how to induce vomiting in the case of an overdose. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. These side effects may go away during treatment as your body adjusts to the medicine. Can you overdose on plaquenil Hydroxychloroquine - Side Effects, Uses, Dosage, Overdose., Hydroxychloroquine Plaquenil Toxicity and. Plaquenil and ringing in ears Taking Plaquenil should be combined with monitoring for any visual problem. You can share any additional information that you may have in the comment box below. References. Roque, M. R. 2015, November 3. Chloroquine and Hydroxychloroquine Toxicity. Plaquenil Toxicity - Symptoms, Treatment, Risk Factors, Retinopathy. Plaquenil, Plaquenil Sulfate, Quineprox.. Plaquenil Hydroxychloroquine Side effects, Images, Uses.. Find patient medical information for Plaquenil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Alcohol or marijuana can make you. Take this medication with a meal or a glass of milk to prevent stomach upset. Common side effects include nausea, loss of appetite, headache, and diarrhea. Plaquenil can cause blurred vision and dizziness. Do not drive or operate heavy machinery until you know how it affects you. Note This document contains side effect information about hydroxychloroquine. Some of the dosage forms listed on this page may not apply to the brand name Plaquenil. For the Consumer. Applies to hydroxychloroquine oral tablet. Along with its needed effects, hydroxychloroquine the active ingredient contained in Plaquenil may cause some unwanted effects.