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. Plaquenil 3 times a week What dosages can you take of plaquenil for arthritis Find reviews for Hydroxychloroquine from other patients. Learn from their experiences about effectiveness, side effects and cost. Mild nausea, constipation, headaches, dizziness, tinnitus Adherence. Usually Burden. A little hard to take Dosage 400 mg. it's an oval pill, not too big and easy to swallow. I don't know of any side effects. Plaquenil “ Side Effects Severe abdominal pain, bloating, constipation. Increased leg spasms @ night. Hair loss, accelerated depression. At the 4th week, itchy, red dots appear along with scalp itching. ” I have been on the plaquenil 200 mgm for about 4 months now. I did stop it for 2 weeks early in the treatment due to having to take a coupld other drugs that seemed to give me side effects. I just quit the plaquenil to give my liver a rest at that time. Noticed nothing different. Plaquenil isn a antiparasitic drug with anti-inflammatory affect. 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. Plaquenil side effects constipation Long-Term Side Effects of Plaquenil for Rheumatoid Arthritis., Hydroxychloroquine Sulfate Related. - Side Effect Search Tinnitus chloroquineChloroquine vs quinine Consumer ratings and reviews for PLAQUENIL. Includes 655 patient ratings with average score of 3.2, comments, side effects, dosage, sex, age, time taken. PLAQUENIL Side Effects, Reviews by Patients -. Let me tell you what weaning down from Plaquenil is like.. Plaquenil and Constipation - Reviews - Treato. Get medical help right away if you have any very serious side effects, including sensitivity to light, vision changes e.g. blurred vision, seeing light flashes/streaks/halos, missing/blacked-out areas of vision, muscle weakness, numbness/tingling/pain of the arms/legs. Tell your doctor if any of the following side effects, as they may be indications of a more serious reaction Headache. Loss of appetite. Dizziness. Nausea. Diarrhea, vomiting, or stomach pain. Skin rash. Plaquenil Side Effects by Likelihood and Severity INFREQUENT side effects. If experienced, these tend to have a Severe expression. A Disorder Of The Retina Of The Eye;. RARE side effects.