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. Chloroquin and ferroquine structure Hydroxychloroquine and drinking alcohol What are some other side effects of Hydroxychloroquine? All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away Dizziness. Headache. Feeling nervous and excitable. But this medicine does not work for all strains of the disease. Hydroxychloroquine is also used for the treatment of rheumatoid arthritis. Symptoms of hydroxychloroquine overdose. Hydroxychloroquine overdose needs to be treated quickly. It is must to get an emergency medical help if there arise certain symptoms. Common side effects may include headache, dizziness, ringing in your ears; nausea, vomiting, stomach pain; loss of appetite, weight loss; mood changes, feeling nervous or irritable; skin rash or itching; or. hair loss. 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. Hydroxychloroquine overdose side effects Hydroxychloroquine Side Effects -, Symptoms and Possible Side Effects of Hydroxychloroquine. Plaquenil guidelines aaoHydroxychloroquine originally made from Overdose symptoms include convulsions, drowsiness, headache, heart problems or heart failure, difficulty breathing and vision problems. Pharmacology Pharmacokinetics. Hydroxychloroquine has similar pharmacokinetics to chloroquine, with rapid gastrointestinal absorption and elimination by the kidneys. Hydroxychloroquine - Wikipedia. Hydroxychloroquine - Side Effects, Dosage, Interactions.. Common and Rare Side Effects for Plaquenil Oral. Hydroxychloroquine is in a class of drugs called antimalarials. It is used to prevent and treat acute attacks of malaria. It is also used to treat discoid or systemic lupus erythematosus and rheumatoid arthritis in patients whose symptoms have not improved with other treatments. Plaquenil or hydroxychloroquine is under the quinolone family. These medications are initially used in the prophylaxis and treatment of malaria. Plaquenil has replaced chloroquine because it produces less retinal side effects. Hydroxychloroquine is a well tolerated medication for various rheumatologic and dermatologic conditions. Its main side effects are gastrointestinal upset, skin rash, headache, and ocular toxicity. Within the eye, hydroxychloroquine negatively impacts the cornea, ciliary body, and retina.