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 hair changes Order aralen medication 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. Re Prednisone, plaquenil and constipation. I haven't experienced any problems with constipation while on prednisone and plaquenil. I had a lot of bowel trouble before I was DXD though, which may be why I am not having problems now, could be that the drugs just evened me out so to speak. Find patient medical information for Plaquenil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. 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 and constipation Hydroxychloroquine Plaquenil Side Effects & Dosage for Malaria, Prednisone, plaquenil and constipation. - HealthBoards Chloroquine interactions PLAQUENIL hydroxychloroquine sulfate tablets is indicated for the treatment of rheumatoid arthritis, and discoid and systemic lupus erythematosus, in patients who have not responded satisfactorily to drugs with less potential for serious side effects. Plaquenil Hydroxychloroquine Sulfate. Plaquenil Oral Uses, Side Effects, Interactions, Pictures.. Side Effects of Plaquenil Hydroxychloroquine, Warnings, Uses. Nov 09, 2018 Hydroxychloroquine is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America. If you've just started on plaquenil, that can cause lots of tummy problems for a couple of months. Are you taking prednisone? Don't hesitate to keep a list of new issues as they come up and call your rheumy's nurse and talk to her. Plaquenil should be taken with food to make it easier for the stomach. Also, some people say you should avoid any dairy with it but to me at least some milk in coffee doesn't make any difference. What I also suggest is lactobacillus, a capsule every day.