Erdafitinib

In this article, we will discuss Erdafitinib (Dosage Overview). So, let’s get started.

Indications

Erdafitinib is indicated for the treatment of adult patients with locally advanced or metastatic urothelial carcinoma (mUC), that has:
• susceptible FGFR3 or FGFR2 genetic alterations, and
• progressed during or following at least one line of prior platinum-containing chemotherapy, including within 12 months of neoadjuvant or adjuvant platinum-containing chemotherapy. Select patients for therapy based on an FDA-approved companion diagnostic for Erdafitinib.

Dosage

Patient Selection

Select patients for the treatment of locally advanced or metastatic urothelial carcinoma with Erdafitinib based on the presence of susceptible FGFR genetic alterations in tumor specimens as detected by an FDA-approved companion diagnostic.

Recommended Dosage and Schedule

The recommended starting dose of Erdafitinib is 8 mg (two 4 mg tablets) orally once daily, with a dose increase to 9 mg (three 3 mg tablets) once daily based on serum phosphate (PO4) levels and tolerability at 14 to 21 days.

Swallow tablets whole with or without food. If vomiting occurs any time after taking Erdafitinib, the next dose should be taken the next day. Treatment should continue until disease progression or unacceptable toxicity occurs.

If a dose of Erdafitinib is missed, it can be taken as soon as possible on the same day. Resume the regular daily dose schedule for Erdafitinib the next day. Extra tablets should not be taken to make up for the missed dose.

Dose Increase based on Serum Phosphate Levels
Assess serum phosphate levels 14 to 21 days after initiating treatment. Increase the dose of Erdafitinib to 9 mg once daily if serum phosphate level is < 5.5 mg/dL and there are no ocular disorders or Grade 2 or greater adverse reactions. Monitor phosphate levels monthly for hyperphosphatemia.

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