How should I manage a 52-year-old non-compliant patient with severe hyperthyroidism (TSH <0.005 uIU/mL, elevated free T4) who is on methimazole 10 mg daily and presents with a foot ulcer?

Management of Severe Hyperthyroidism in a Non-Compliant Patient with Foot Ulcer

Immediately increase methimazole to 20 mg three times daily (60 mg total daily dose), obtain urgent endocrinology consultation, address the foot ulcer aggressively with wound care and infection evaluation, and implement strict medication adherence monitoring.

Thyroid Management

Your patient has severe, uncontrolled hyperthyroidism (TSH <0.005, T4 18.1, Free T4 Index 8.5) despite being on methimazole 10 mg daily for 2 months. This represents treatment failure, likely due to non-compliance or inadequate dosing.

Immediate Medication Adjustment

• Increase methimazole to 60 mg daily in divided doses (20 mg three times daily at 8-hour intervals), which is the FDA-recommended dose for severe hyperthyroidism 1
• The current 10 mg daily dose is grossly inadequate for this degree of thyrotoxicosis—severe hyperthyroidism requires 60 mg daily initially 1
• Non-compliance is the most common reason for apparent antithyroid drug resistance, occurring in up to 6 of 9 patients who fail to respond to therapy 2

Critical Monitoring and Follow-up

• Obtain endocrinology consultation urgently given the severity of hyperthyroidism and presence of complications (foot ulcer) 3
• Recheck thyroid function tests (TSH, free T4, T3) in 2-3 weeks to assess response 4
• Consider directly observed therapy or supervised medication administration given documented non-compliance 2, 5
• Monitor for methimazole toxicity, particularly agranulocytosis—instruct patient to report fever or sore throat immediately 1

Addressing Non-Compliance

This is the critical issue. Non-compliance is the most likely explanation for treatment failure in patients not responding to antithyroid drugs 2. With this patient's documented non-compliance history:

• Consider switching to once-daily dosing after initial control is achieved, as methimazole has a longer duration of action and can be given once daily for maintenance 6
• Arrange for supervised medication administration if possible
• Educate patient on serious cardiovascular and mortality risks of untreated hyperthyroidism 7

Foot Ulcer Management

The foot ulcer requires immediate attention as hyperthyroidism can impair wound healing and increase infection risk.

Wound Assessment and Treatment

• Evaluate for infection immediately—look for cellulitis extending >2 cm, purulent drainage, erythema, warmth, or systemic signs (fever, elevated WBC) 3
• If infection is present with systemic signs or metabolic instability (which hyperthyroidism can cause), this is a severe infection requiring hospitalization 3
• Obtain wound cultures if infection suspected before starting antibiotics 3
• For mild-moderate infections without systemic toxicity, oral antibiotics covering gram-positive cocci are appropriate 3

Metabolic Stabilization

• Correct hyperglycemia aggressively—thyrotoxicosis worsens glycemic control, and improved glucose control aids wound healing 3
• The severe hyperthyroidism is likely contributing to poor wound healing and metabolic instability
• Consider beta-blocker (propranolol or atenolol) for symptomatic relief of thyrotoxic symptoms while awaiting methimazole effect 3

Definitive Treatment Consideration

Given the severity of hyperthyroidism, non-compliance history, and acute complications:

• Discuss definitive treatment options (radioactive iodine or thyroidectomy) with endocrinology, as this patient may not be a good candidate for long-term medical management 4, 7
• Radioactive iodine or surgery should be strongly considered after achieving initial control, as relapse rates are high in non-compliant patients 4
• If the patient remains non-compliant or fails to respond to 60 mg methimazole after 4-6 weeks, definitive therapy becomes essential 5, 7

Common Pitfalls to Avoid

• Do not continue inadequate dosing—10 mg daily is insufficient for severe hyperthyroidism and will lead to continued complications 1, 8
• Do not delay endocrinology referral—this patient has severe disease with complications requiring specialist input 3
• Do not ignore the compliance issue—simply increasing the dose without addressing adherence will likely fail 2
• Do not overlook the foot ulcer—uncontrolled hyperthyroidism significantly impairs wound healing and increases infection risk 3

The combination of severe hyperthyroidism, documented non-compliance, and an active foot ulcer creates a high-risk situation requiring aggressive intervention on multiple fronts simultaneously.