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. Hydroxychloroquine rash Sanofi aventis plaquenil Call your doctor right away if you notice any of these side effects Wheezing or trouble breathing. Severe or bloody diarrhea. Blurred vision or eye problems. Skin rash or itching. Unexplained fever, unusual bleeding or bruising. If you notice these less serious side effects, talk with your doctor Headache. Nausea or upset stomach. Diarrhea. Appetite loss Retinal toxicity from hydroxychloroquine is rare, but even if the medication is discontinued, vision loss may be irreversible and may continue to progress. It is imperative that patients and physicians are aware of and watch for this drug’s ocular side effects. The prescribing physician counsels the patients on the possible side effects including weight gain, hirsutism, and skin changes. The physician goes on to state that corticosteroids can also cause a number of changes on the patients laboratory studies. 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 side effects medbullets Plaquenil Side Effects Common, Severe, Long Term -, Hydroxychloroquine-Induced Retinal Toxicity - American. Plaquenil and tb test Hydroxychloroquine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away headache; dizziness; loss of appetite; nausea; diarrhea; stomach pain; vomiting; skin rash; If you experience any of the following symptoms, call your doctor immediately Hydroxychloroquine MedlinePlus Drug Information. Drug Reactions and Side Effects - Pharmacology - Medbullets.. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Side effects include irritability, headache, weakness, hair lightening or loss, stomach upset, nausea, dizziness, muscle pain, rash and itching. Rarely, hydroxychloroquine can affect the bone marrow leading to reduced white blood cells leukopenia or platelets thrombocytopenia and abnormal red blood cells. Rare but potentially serious eye toxicity can occur. 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. Rheumatoid Arthritis. The action of hydroxychloroquine is cumulative and may require weeks to months to achieve the maximum therapeutic effect see CLINICAL PHARMACOLOGY. Initial adult dosage 400 mg to 600 mg 310 to 465 mg base daily, administered as a single daily dose or in two divided doses.