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 and effects on growing fetus Plaquenil 3 times a week Nausea and diarrhea This can often can be combatted by taking Plaquenil with food or milk. If you experience stomach upset while taking generic hydroxychloroquine, ask your doctor about trying name-brand Plaquenil instead. I've been on Plaquenil for almost 2 wks now and I'm also taking Prednisone, could one of these be causing my extreme stomach cramps? 2 nights ago, I had a cheeseburger and mac and cheese and I thought I was going to die about 1 in the morning. I ended up throwing up once and then I had diarrhea for a bit and then it passed once my system cleared. Hydroxychloroquine Plaquenil™ What is hydroxychloroquine? Hydroxychloroquine also known as hydroxychloroquine sulfate is an arthritis medicine. that also can be used to prevent malaria. It is available in the United States by prescription only. It is sold under the brand name Plaquenil and it is also sold as a generic medicine. It is. 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 for diarrhea Stomach problems with Plaquenil • Johns Hopkins Arthritis Center, Plaquenil and stomach issues." Lupus Community - Support. Malarone chloroquine resistance ncbiHydroxychloroquine retinopathy still alive and wellWhat does hydroxychloroquine do for ra Doctors give unbiased, trusted information on whether Hydroxychloroquine can cause or treat Diarrhea Dr. Cattano on plaquenil and diarrhea Temporary GI disturbances are quite common with antibiotics, so a little patience with this understanding comes handy to get the intended benefit from the treatment. Plaquenil and diarrhea - Answers on HealthTap. Medicines for the Prevention of Malaria While Traveling.. Plaquenil/ Diarrhea - Autoimmune diseases - Inspire. Plaquenil is the brand name for the prescription drug hydroxychloroquine. It's used to treat and prevent malaria infection, and to reduce symptoms and progression of autoimmune diseases such as. I had severe nausea and diarrhea when started on Plaquenil 2 X 200mg tabs once daily almost 3yrs ago. As I also have Crohn's Disease and an Ileostomy this was putting me at serious risk. I was told to stop the Plaquenil until my GI symptoms disappeared. In some people, HCQ may cause gastrointestinal problems, such as nausea, vomiting, upset stomach, cramps, or diarrhea. These may occur for the first few days a person takes the drug while the body adjusts to the medication. Loss of appetite, tiredness, weakness, or headache are uncommon side effects and typically go away over time. Rare.