Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Plaquenil does it affect the eyesight Does hydroxychloroquine cause diarrhea Chloroquine side effects pregnancy We would like to show you a description here but the site won’t allow us. Vitamin B-12 has not been shown to interact with Synthroid, but you should still talk to your health care provider before taking it, and there are other medication interactions that you should know about if you take Synthroid. A doctor examines a woman's thyroids in her office. The study is based on hydroxychloroquine sulfate and levothyroxine sodium the active ingredients of Plaquenil and Synthroid, respectively, and Plaquenil and Synthroid the brand names. Other drugs that have the same active ingredients e.g. generic drugs are not considered. Taking hydroxychloroquine long-term or at high doses may cause irreversible damage to the retina of your eye. Hydroxychloroquine is also an antirheumatic medicine and is used to treat symptoms of rheumatoid arthritis and discoid or systemic lupus erythematosus. Do hydroxychloroquine and levrthryrine interact Levothyroxine sodium and Hydroxychloroquine sulfate drug., Does Vitamin B-12 Interfere With Synthroid Medicines. Sulfasalazine and plaquenilPlaquenil related cardiomyopathyPlaquenil side effects sweating This review analyzes the effectiveness and drug interactions between Meclizine hydrochloride and Levothyroxine thyroid. It is created by eHealthMe based on reports from Food and Drug Administration FDA, and is updated regularly. On eHealthMe, you can evaluate side effects and drug interactions from millions of FDA reports. Meclizine hydrochloride and Levothyroxine thyroid drug.. Plaquenil and Synthroid drug interactions - eHealthMe. Hydroxychloroquine Side-effects, uses, time to work. Using multivitamin with minerals together with levothyroxine may decrease the effects of levothyroxine. You should separate the administration of levothyroxine and multivitamin with minerals by at least 4 hours. If your doctor does prescribe these medications together, you may need a dose adjustment or special test to safely use both medications. Drug Interactions. Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Hydroxychloroquine is usually taken with food or milk to prevent stomach upset. The dosage and length of treatment are based on your medical condition and response to therapy. In children, dosage is also based on weight.