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 intestinal problems Who created chloroquine Rashes due to hydroxychloroquine 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. 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. Some side effects of hydroxychloroquine 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. 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 Drugs & Medications That Can Trigger Psoriasis Flare-Ups, Side Effects of Aralen Chloroquine, Warnings, Uses Plaquenil and blood clotsAralen hydrochlorideUfo sign plaquenil 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.. Hydroxychloroquine Side Effects Common, Severe, Long Term.. Psoriasis Causes & Triggers National Psoriasis Foundation. Find patient medical information for Chloroquine Phosphate Bulk on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Side-effects which occur at doses used in the prophylaxis or treatment of malaria are generally not serious. Overdose Chloroquine is very toxic in overdosage; overdosage is extremely hazardous and difficult to treat. Chloroquine is a relatively well-tolerated. medicine. The most common adverse reactions reported are stomach pain, nausea, vomiting, and headache. These side effects can often be lessened by taking chloroquine with food. Chloroquine may also cause itching in some people. All medicines may have some side effects.