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. Nortriptyline and plaquenil What does plaquenil do for porphyria We study how severe was Withdrawal syndrome, when it was recovered, drug effectiveness, race, and more among people who take Plaquenil. This study is created by eHealthMe based on reports of 1,993 people who have side effects when taking Plaquenil from sources other than FDA, and is updated regularly. Plaquenil hydroxychloroquine belongs to a group of medicines called quinolines. Plaquenil 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, and Southern Asia. 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; 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 severe side effects Plaquenil Side Effects on Your Eyes and Vision, Plaquenil Uses, Dosage & Side Effects - How to pay for plaquenil Serious side effects and their symptoms can include the following blurred vision or other vision changes. ringing in your ears or hearing loss. angioedema, or rapid swelling of your skin. hives. mild or severe bronchospasm that causes trouble breathing. sore throat. unusual bleeding or. Hydroxychloroquine Side Effects, Dosage, Uses, and More. Common and Rare Side Effects for Plaquenil Oral. Long-Term Side Effects of Plaquenil for Rheumatoid.. Aug 14, 2017 Plaquenil can cause serious side effects when used in high doses for chronic diseases such as RA over the long term. The New Zealand Dermatological Society recommends that to decrease the risk of retina damage, no more than 200mg of Plaquenil should be taken a day, and a dose of 400mg per day should be taken no longer than a few weeks. Chloroquine has been replaced with hydroxychloroquine as it has less side effects. Eye Exam Before Starting Treatment. If a person is going to be treated long-term with Plaquenil, they need to have a thorough dilated eye exam with best corrected visual acuity, central visual field, color vision, and dilated examination of the retina. Some side effects of chloroquine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.