What Monitoring Tests Are Needed for LPP Medicines?

When treating Lichen Planopilaris (LPP) with systemic (body-wide) medications, you are using drugs that reduce inflammation by modifying or suppressing your immune system. While these medications—often used “off-label” for LPP—can help halt hair loss, they come with specific safety risks. To maximize safety, doctors rely on baseline and follow-up monitoring.

Monitoring typically involves checking your complete blood count (CBC) (to ensure healthy levels of white blood cells, red blood cells, and platelets), kidney function (often measured by a serum creatinine or eGFR test), liver enzymes (transaminases), blood pressure, or eye health. The exact tests and frequency depend on the drug, your dose, and your medical history.

🚨 When to Call Your Doctor Immediately

Monitoring tests do not replace paying attention to your body. Do not wait for your next scheduled lab test if you feel ill. Contact your prescriber immediately (or seek emergency care) if you experience:

• Signs of severe infection: Fever, chills, or severe sore throat
• Blood or liver issues: Unusual bruising, bleeding, mouth ulcers, dark urine, or yellowing of the skin/eyes (jaundice)
• Kidney or blood pressure issues: Markedly reduced urination, severe swelling, severe headache, confusion, or extremely high blood pressure
• Eye issues: Any new changes in your vision

Hydroxychloroquine (Plaquenil)

Hydroxychloroquine monitoring focuses primarily on the eyes and kidneys. To minimize risks, the daily dose should generally not exceed 5 mg per kilogram of your actual (real) body weight ^[1].

• Baseline Checks: You need a baseline eye exam within your first year of treatment ^[2]. This checks for pre-existing conditions and uses sensitive tools like OCT (optical coherence tomography, a non-invasive scan of the retina), FAF (fundus autofluorescence), and automated visual field testing ^[1][3]. Your kidney function should also be checked, as kidney impairment increases the risk of eye toxicity and may require a lower dose ^[1][2].
• Follow-up Monitoring: Regular eye screening is essential because higher doses and longer use increase the risk of permanent retinal damage (retinopathy) ^[1]. If you have no major risk factors and are on the correct dose, annual eye screenings might be deferred for your first 5 years on the drug, but must begin by year 5 ^[2]. However, if you have risk factors (kidney disease, older age, tamoxifen use, or pre-existing macular disease), annual screenings must start immediately ^[3]. For patients of Asian descent, toxicity can appear in a different pattern, so the eye doctor should screen a wider area of the retina ^[4].

Methotrexate

⚠️ CRITICAL WARNING: Methotrexate for LPP is taken ONCE WEEKLY, NEVER DAILY. Taking it daily can cause life-threatening toxicity. Your doctor will also likely prescribe a folic acid supplement to help reduce side effects.

Methotrexate requires close monitoring of your blood, liver, and kidneys, as well as screening for infections (like Hepatitis B/C, HIV, and Tuberculosis) based on your risk ^[5].

• Baseline Checks: Your doctor will check a baseline CBC, liver function, and kidney function ^[5]. Baseline abnormalities increase your risk for side effects and help your doctor choose the safest dose ^[5][6]. You will also need a pregnancy test if you can become pregnant.
• Follow-up Monitoring: Monitoring is frequent at first. Standard protocols often require checking your blood, liver, and kidneys every 1 to 4 weeks when starting or changing your dose, before spacing out to every 8 to 12 weeks (2 to 3 months) once you are stable ^[7]. Do not start new over-the-counter NSAIDs (like ibuprofen), herbal products, or supplements without asking your doctor, as they can interact with methotrexate.

Mycophenolate (Mycophenolate Mofetil)

Mycophenolate heavily suppresses the immune system. Monitoring focuses on preventing pregnancy and checking for drops in blood cell counts.

• Baseline Checks & Pregnancy: Mycophenolate is teratogenic (causes severe birth defects and miscarriages) ^[8]. For people who could become pregnant, strict pregnancy testing is required before, during, and for at least 6 weeks after stopping treatment, alongside the use of two forms of effective contraception ^[8]. (Men who can father children may also be subject to contraceptive guidelines based on the product label). Baseline blood, liver, and kidney tests are also required.
• Follow-up Monitoring: Mycophenolate can lower your white blood cells (lymphopenia or neutropenia), red blood cells (anemia), and platelets, increasing your risk of severe infections and bleeding ^[9][10]. Doctors typically check a CBC frequently during the first few months (e.g., weekly to monthly), spacing out to every few months once you are stable.

Cyclosporine

Cyclosporine monitoring emphasizes kidney health and blood pressure, as both can rapidly worsen on this drug.

• Baseline Checks: You will need baseline blood pressure readings, kidney function tests (creatinine and eGFR), and often checks for cholesterol, potassium, and magnesium ^[11]. A strict review of your other medicines is critical: cyclosporine interacts dangerously with many drugs, including certain statins (like simvastatin) and grapefruit juice, which can cause severe muscle and kidney damage ^[12][11].
• Follow-up Monitoring: Because cyclosporine commonly causes high blood pressure and kidney damage (nephrotoxicity), monitoring must be frequent ^[11]. You may need blood tests and blood pressure checks every 2 weeks initially, and then monthly ^[11]. A confirmed rise in your serum creatinine of 30% or more is a key warning sign that your kidneys are stressed ^[13]. However, do not wait for this threshold or stop the drug on your own—your prescriber must interpret these results and adjust your dose safely.

Note: Before starting any immunosuppressant, discuss your vaccination status with your doctor, as live vaccines typically must be avoided while on these treatments.