What Are Prednisone Side Effects in PG and How Is It Tapered?

Prednisone is a systemic corticosteroid that can quickly reduce the severe inflammation of pyoderma gangrenosum (PG), but it carries risks of short- and long-term side effects. While some short courses of prednisone may be stopped easily, prolonged or high-dose courses change how your body naturally produces stress hormones and require a careful “taper” (slow dose reduction) to prevent life-threatening complications ^[1][2].

It is important to remember that not everyone experiences every side effect, and controlling your painful ulcers is a priority. Your care team will work with you to manage these risks and decide on the safest treatment path.

Potential Side Effects and When to Seek Help

Prednisone can cause a variety of side effects. Knowing what to watch for helps you understand when to contact your doctor and when to seek emergency care.

Infection Risk

Prednisone suppresses your immune system, which helps calm your PG but makes you more vulnerable to infections ^[1][3]. Because steroids can hide normal signs of infection (like blunting a fever), you must be extra vigilant ^[1].

• Action: Call your doctor promptly or seek emergency care if you develop fever, chills, a new cough, shortness of breath, urinary symptoms, or rapidly worsening redness, warmth, pain, or drainage around your ulcer. Do not try to self-diagnose whether your ulcer is infected or just flaring.

Blood Sugar, Blood Pressure, and Fluid Retention

Prednisone can cause high blood sugar—even in people who have never had diabetes ^[4]. It can also lead to high blood pressure, fluid retention, and weight gain ^[5]. Your doctor should regularly monitor your blood pressure and glucose levels ^[4].

• Action: Call your doctor if you experience extreme thirst, frequent urination, major swelling in your legs, or unexplained breathlessness.

Mood and Sleep Changes

Steroids can significantly affect your mental health. You may experience insomnia, anxiety, depression, or hypomania (feeling unusually energized, having racing thoughts, engaging in impulsive behavior, or needing very little sleep) ^[6][7].

• Action: Seek urgent medical help if you experience hallucinations (psychosis), severe agitation, unsafe behavior, or suicidal thoughts ^[8][7].

Stomach Problems

Prednisone increases the risk of gastrointestinal issues like heartburn or stomach ulcers ^[9]. The risk is highest if you are 65 or older, have a history of ulcers, or take nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen ^[9]. Your doctor may suggest a stomach-protecting medication if you are at high risk, but it is not automatically required for everyone ^[10].

• Action: Go to the emergency room immediately if you vomit blood or have black, tarry stools, as these can be signs of severe bleeding.

Bone and Eye Health

Long-term use can lead to osteoporosis (thinning of the bones) and increase your risk of cataracts or glaucoma (raised eye pressure) ^[11][12]. Report any new vision changes to your doctor.

Planning for Bones and Vaccinations

• Bone Protection: If you expect to take a daily dose of prednisone (2.5 mg or more) for three months or longer, your doctor should evaluate your risk for bone fractures ^[13][14]. This threshold does not mean you automatically need medication; rather, it is a prompt for assessment (like a bone density scan) ^[15]. Your care plan may include weight-bearing exercise, fall prevention, calcium and vitamin D supplements, and specific medications like bisphosphonates (drugs that slow bone loss) ^[14][15].
• Vaccination Planning: Because prednisone weakens your immune system, plan vaccinations carefully ^[3]. Non-live vaccines are generally safe, though they may be less effective while you are on steroids ^[3]. However, live vaccines are usually avoided if you are taking high doses of steroids (such as 20 mg or more per day for at least 14 days) due to the risk of severe infection ^[3][16]. Never get a vaccine without discussing the timing with your prescribing doctor first.

The Danger of Stopping Suddenly: Adrenal Suppression

When you take prednisone for an extended period, your brain senses the extra steroids in your system and stops telling your adrenal glands to produce cortisol, your body’s natural stress hormone ^[17][1]. This is called adrenal suppression.

If you stop taking prednisone abruptly, your body will not have enough cortisol to function normally or respond to physical stress (like an illness, injury, or surgery). This can trigger an adrenal crisis—a life-threatening medical emergency ^[18][19].

• Emergency Warning Signs: Go to the emergency room immediately if you experience fainting or collapse, severe dizziness, profound weakness, confusion, severe abdominal pain, persistent vomiting or diarrhea, or an inability to keep your prednisone pills down ^[18][19][20].
• Safety Planning: Ask your doctor for a “sick-day plan” (stress dosing) so you know how to adjust your dose if you become severely ill or need surgery. It is also highly recommended to carry a steroid emergency card or wear a medical-alert bracelet ^[21].

How Prednisone Is Tapered

To safely come off prolonged prednisone, your doctor will prescribe a tapering schedule. Tapering reduces the risk of withdrawal and adrenal crisis, though it does not guarantee your PG will not return ^[2][22].

• A Personalized Schedule: There is no single universal tapering schedule. Your plan depends on your prednisone dose and duration, previous steroid courses, recovery of your adrenal glands, and whether you have started a “steroid-sparing” medication to help control your PG long-term ^[2][23].
• The Tapering Process: Higher doses are generally reduced more quickly, but the taper slows down significantly as you approach “physiologic doses” (the normal amount of cortisol your body makes) ^[2]. The final stages can take months and may require morning blood tests to check your adrenal function ^[24][18].
• Withdrawal vs. Flare: As your dose decreases, you might experience fatigue, nausea, body aches, or dizziness. These can be signs of glucocorticoid withdrawal syndrome or adrenal insufficiency ^[25][18]. Alternatively, if your ulcers worsen, it could be a PG flare or an infection ^[22].
• Never Adjust Your Own Dose: Do not try to guess what your symptoms mean. Contact your care team promptly, and never change your dose on your own.