Hydroxychloroquine
Also known as: Plaquenil · HCQ
Hydroxychloroquine, often known by the brand name Plaquenil, is one of the most widely used medicines in rheumatology. It is gentle for most patients and quietly does a lot of important work in lupus and inflammatory arthritis.
Calm, careful medication review by a consultant rheumatologist.
What this medicine is
Hydroxychloroquine is a disease-modifying medicine that calms parts of the immune system. It is taken as a tablet, usually once or twice a day.
Uses and context
It is a foundation treatment in systemic lupus erythematosus (SLE) and is also used in rheumatoid arthritis, Sjogren's syndrome and some overlap conditions.
How this relates to rheumatology care
In clinic I dose hydroxychloroquine carefully by your body weight, review your baseline eye health, and plan regular eye screening. I also review kidney and liver function periodically. Most patients tolerate it very well.
What safety checks may matter
Baseline eye check and regular retinal screening
Weight-based dosing, not simply a fixed dose
Kidney and liver function checked periodically
Review of other medicines that may interact
ECG check in selected patients (rhythm concerns)
Side effects and red flags
If you have emergency symptoms such as severe allergic reaction, breathing difficulty, chest pain, stroke-like symptoms, severe abdominal pain, vomiting blood, black stools, sudden vision loss, severe infection symptoms, or severe weakness or confusion, please seek urgent medical care first rather than waiting for a WhatsApp reply.
New blurred vision, distorted vision or difficulty reading
Muscle weakness that is new or getting worse
Palpitations, fainting or new heart-rhythm symptoms
Severe skin rash or blistering
Signs of severe allergic reaction
Things worth knowing day to day
Take with food to reduce stomach upset.
Do not stop suddenly in lupus without discussing with me; it protects against flares.
Tell me about any planned pregnancy; hydroxychloroquine is often continued in pregnancy under review.
Attend your eye screening appointments even when you feel well.
Questions patients often ask me about this medicine
Speak with me
If you have been prescribed hydroxychloroquine or would like to understand it before starting, please message my clinic. I would like to answer your questions calmly.
Trusted patient information sources
Other medications used in rheumatology care
This page is for general education only and does not replace medical advice. Please consult a qualified healthcare professional for diagnosis and treatment. Do not start, stop, or change any medicine without advice from your doctor.