What You Should Know About Myfortic Side Effects

If you've been prescribed Myfortic (Mycophenolic Acid), you're probably taking it to prevent organ rejection after a kidney transplant — or possibly for an autoimmune condition like lupus. Either way, it's doing important work in your body by keeping your immune system in check.

But like all immunosuppressants, Myfortic comes with side effects. Some are mild and manageable. Others are serious and need immediate medical attention. This guide breaks down what to expect, what's normal, and when to pick up the phone and call your doctor.

What Is Myfortic?

Myfortic is the brand name for Mycophenolic Acid (also called Mycophenolate Sodium). It belongs to a class of drugs called selective immunosuppressants. It works by blocking an enzyme called IMPDH that your immune cells need to multiply. By slowing down your immune response, Myfortic helps prevent your body from rejecting a transplanted kidney.

For a deeper dive, check out our guide on what Myfortic is, its uses, and dosage.

Common Side Effects of Myfortic

These side effects are reported frequently in clinical trials and are generally manageable with your doctor's help. They don't always mean you need to stop taking the medication, but you should let your doctor know about them:

• Nausea and vomiting — One of the most common complaints. Myfortic's enteric coating is designed to reduce stomach irritation compared to Mycophenolate Mofetil (CellCept), but nausea can still occur.
• Diarrhea — Frequent and sometimes persistent. Staying hydrated is important.
• Constipation — Less common than diarrhea but still reported.
• Low blood cell counts — Including anemia (low red blood cells), leukopenia (low white blood cells), and thrombocytopenia (low platelets). This is why regular blood work is essential.
• Infections — Urinary tract infections and upper respiratory infections are common because your immune system is suppressed.
• Insomnia — Difficulty sleeping affects some patients.
• Headache — Mild to moderate headaches are commonly reported.
• Peripheral edema — Swelling in your hands, feet, or ankles.
• Painful urination — May indicate a urinary tract infection; report to your doctor.
• Post-surgical pain — Especially common in the period right after transplant surgery.

Serious Side Effects: When to Call Your Doctor Immediately

Myfortic carries a boxed warning — the FDA's most serious safety alert. These side effects are less common but can be life-threatening. Call your doctor or go to the emergency room if you experience any of the following:

Serious Infections

Because Myfortic suppresses your immune system, you're more vulnerable to infections — including bacterial, viral, fungal, and protozoal infections. Watch for:

• Fever above 100.4°F (38°C)
• Chills, body aches, or flu-like symptoms that won't go away
• Cough, shortness of breath, or chest pain
• Painful or cloudy urine
• Sores that won't heal

Specific infections to be aware of include CMV (Cytomegalovirus) reactivation, which is common in transplant patients, and Hepatitis B or C reactivation in patients with a history of these infections.

Progressive Multifocal Leukoencephalopathy (PML)

This is a rare but potentially fatal brain infection caused by the JC virus. Symptoms include:

• Weakness on one side of your body
• Vision changes
• Confusion or difficulty thinking
• Problems with balance or coordination

If you notice any neurological changes, contact your doctor immediately.

Polyomavirus-Associated Nephropathy (PVAN)

This viral kidney infection can lead to loss of your transplanted kidney. Your doctor will monitor for this through regular lab work, but symptoms may include rising creatinine levels and decreased urine output.

Lymphoma and Other Cancers

Long-term immunosuppression increases your risk of lymphomas and skin cancers. Report any:

• Unexplained lumps or swollen lymph nodes
• Unexplained weight loss
• Night sweats
• New or changing skin lesions or moles

Severe GI Problems

While mild GI issues are common, severe gastrointestinal bleeding, perforation, or ulceration can occur. Seek immediate help for:

• Blood in your stool or black, tarry stools
• Vomiting blood
• Severe abdominal pain

Pure Red Cell Aplasia (PRCA)

A rare condition where your bone marrow stops making red blood cells. Symptoms include extreme fatigue, pale skin, and shortness of breath.

Specific Populations at Higher Risk

Pregnant Women and Women of Childbearing Age

Myfortic can cause miscarriage and serious birth defects. Women of childbearing potential must use effective contraception during treatment and for at least 6 weeks after stopping Myfortic. If you think you might be pregnant, contact your doctor immediately. Men taking Myfortic should also use contraception during treatment and for 90 days after stopping.

Older Adults

Older patients may be more susceptible to infections and certain side effects due to age-related changes in immune function and kidney function.

Patients With Kidney Problems

If you have severe kidney impairment beyond what's expected for a transplant patient, your doctor may need to adjust your dose or monitor you more closely.

Patients With GI Disease

If you have a history of ulcers, GI bleeding, or other digestive tract problems, Myfortic's GI side effects may be more pronounced.

How to Manage Common Side Effects

Here are some practical tips for dealing with the more manageable side effects:

• For nausea: Take Myfortic on an empty stomach as directed (1 hour before or 2 hours after meals). Eating small, bland snacks between doses may help. Talk to your doctor before taking any anti-nausea medications.
• For diarrhea: Stay hydrated with water and electrolyte drinks. Avoid high-fiber foods, caffeine, and dairy if they make it worse. Don't take anti-diarrheal medications without asking your doctor first.
• For infections: Wash your hands frequently, avoid crowds during cold and flu season, and stay up-to-date on recommended (non-live) vaccines. Avoid contact with people who are sick.
• For low blood counts: Keep all your scheduled blood work appointments. Your doctor will monitor your CBC regularly and adjust your dose if needed.
• For insomnia: Practice good sleep hygiene — consistent bedtime, dark room, no screens before bed. Talk to your doctor if it persists.
• For swelling: Elevate your feet when resting and reduce salt intake. Report sudden or significant swelling to your doctor.

Important: Never crush, chew, or break Myfortic tablets. The enteric coating protects your stomach and ensures the medication is absorbed properly. Swallow them whole.

Final Thoughts

Side effects are a reality of immunosuppressive therapy, but most common Myfortic side effects are manageable with the right support. The key is staying in close contact with your doctor, keeping up with regular blood work, and knowing the warning signs that need immediate attention.

If cost is a barrier to staying on your medication, check out our guide on how to save money on Myfortic. And if you're having trouble finding it at your pharmacy, Medfinder can help you locate pharmacies near you with Myfortic in stock.