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 methotrexate taken together Hydroxychloroquine sulfate 200 mg brand name Can plaquenil make viruses last linger For the Consumer. Cold, clammy skin. decreased urine. drowsiness. dry mouth. fast, weak pulse. increased thirst. lightheadedness, dizziness, or fainting. loss of appetite. muscle pain or cramps. numbness or tingling in the hands, feet, or lips. Get medical help right away if you have any very serious side effects, including severe dizziness, fainting, fast/slow/irregular heartbeat, seizures. This medication may cause serious eye. If you have psoriasis. If you have porphyria. If you are taking cimetidine. If you. What are some other side effects of Chloroquine? 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. 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. Chloroquine side effects psoriasis Side Effects of Primaquine Phosphate Tablets, Warnings, Uses, Chloroquine Oral Uses, Side Effects, Interactions. Can plaquenil cause a rash Tell your doctor right away if you experience any of the following severe side effects Unusual behavior or mood changes. Severe diarrhea. Vision problems or blurred vision. Trouble reading words or seeing parts of objects. Sensitivity to sunlight. Hearing loss. Ringing in the ears. Chloroquine Aralen - Side Effects, Dosage, Interactions.. Chloroquine Indications, Side Effects, Warnings -. Chloroquine - FDA prescribing information, side effects.. Our Aralen chloroquine phosphate Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. Lithium aggravates psoriasis in about half of those with psoriasis who take it. Antimalarials Plaquenil, Quinacrine, chloroquine and hydroxychloroquine may cause a flare of psoriasis, usually two to three weeks after the drug is taken. Hydroxychloroquine is the least likely to cause side effects. This represents a total dose of 2.5 g chloroquine phosphate or 1.5 g base in three days. The dosage for adults of low body weight and for infants and children should be determined as follows First dose 10 mg base per kg but not exceeding a single dose of 600 mg base.