Xelstrym Patch Dosage

Pretreatment Screening

​Prior to treating patients with XELSTRYM, assess:

• ​for the presence of cardiac disease (i.e., perform a careful history, family history of sudden death or ventricular arrhythmia, and physical exam).
• ​the family history and clinically evaluate patients for motor or verbal tics or Tourette’s syndrome before initiating XELSTRYM.

Recommended Dosage

​Pediatric Patients 6 to 17 years

• ​Recommended starting dose of XELSTRYM in pediatric patients 6 to 17 years is 4.5 mg/9 hours. Dosage may be adjusted in weekly increments of 4.5 mg up to a maximum recommended dose of 18 mg/9 hours.

Adults

• ​Recommended starting dose of XELSTRYM in adults is 9 mg/9 hours. Dosage may be adjusted up to a maximum recommended dose of 18 mg/9 hours.

​Apply XELSTRYM to the application site 2 hours before an effect is needed and remove within 9 hours after application. Dose titration and final dosage should be individualized depending on clinical response and tolerability.

Important Administration Instructions

• Apply one XELSTRYM transdermal system at a time for not more than 9 hours. Use only one XELSTRYM per 24 hours.
• Apply XELSTRYM to clean (void of lotions, oils, or gels), dry (not wet), and intact skin at the selected application site. Application sites include: hip, upper arm, chest, upper back, or flank. Select a different application site each time a new XELSTRYM transdermal system is applied.
• Avoid touching the adhesive side of XELSTRYM in order to avoid absorption of amphetamine. If the adhesive side is touched, immediately wash hands with soap and water.
• If the XELSTRYM transdermal system lifts at the edges, reattach XELSTRYM by pressing firmly and smoothing down the edges of the system. If XELSTRYM comes off completely, apply a new XELSTRYM transdermal system. XELSTRYM should not be applied or re-applied with dressings, tape or other common adhesives.
• Avoid exposing the application site to direct external heat sources, such as hair dryers, heating pads, electric blankets, heated water beds, etc., while wearing XELSTRYM. When heat is applied to XELSTRYM after application, both the rate and the extent of absorption are increased.

2.4 Switching from Other Amphetamine Products

For patients switching from another medication or any other amphetamine product, discontinue that treatment, and titrate with XELSTRYM using the titration schedule​.

Do not substitute for other amphetamine products on a milligram-per-milligram basis because of different amphetamine base compositions and differing pharmacokinetic profiles​.

Dosage in Patients with Renal Impairment

In patients with severe renal impairment (GFR 15 to < 30 mL/min/1.73 m2), the maximum dose should not exceed 13.5 mg/9 hours. The maximum recommended dose in end stage renal disease (GFR < 15 mL/min/1.73 m2) patients is 9 mg/9 hours.

Dosage Modification due to Drug Interactions

Agents that alter urinary pH can impact excretion and alter blood levels of amphetamines. Acidifying agents (e.g., ascorbic acid) decrease blood levels; adjust XELSTRYM dosage based on clinical response.