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. Side effects of stopping plaquenil cold turkey Hydroxychloroquine actavis Chloroquine pubchem Chloroquine phosphate lethal Common Side Effects of Plaquenil. Tell your doctor if any of the following side effects, as they may be indications of a more serious reaction Headache Find patient medical information for Plaquenil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Some side effects of hydroxychloroquine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. 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. Common side effects of plaquenil Hydroxychloroquine Oral Route Side Effects - Mayo Clinic, Plaquenil Oral Uses, Side Effects, Interactions. Dosage of plaquenil for lichen planopilarisIs chloroquine in liquidAnti malarial tablets chloroquinePlaquenil 200 mg malárieChloroquine doxycycline Common side effects include vomiting, headache, changes in vision and muscle weakness. Severe side effects may include allergic reactions. Although all risk cannot be excluded it remains a treatment for rheumatic disease during pregnancy. Hydroxychloroquine is in the antimalarial and 4-aminoquinoline families of medication. Hydroxychloroquine - Wikipedia. Hydroxychloroquine Side Effects Common, Severe, Long Term.. The Risk of Retinal Toxicity with Plaquenil. In this review, we analyze Plaquenil side effects by the time on the drug, gender and age of the people who have side effects while taking Plaquenil. The review is based on 57,733 people who have side effects while taking the drug from Food and Drug Administration FDA. The information that eHealthMe analyzes includes What are the side effects of Plaquenil? The most common side effects are diarrhea, nausea, vomiting, headache, dizziness, skin rash or black spots when you look at things. Most side effects will go away when your body gets used to the medicine. Tell your doctor if you have these side effects. A lower dose may stop them. Hydroxychloroquine Plaquenil is used to treat malaria, lupus, and rheumatoid arthritis. Learn about side effects, warnings, dosage, and more.