Friday, March 27, 2009

Daytrana Dosing Equivalents to Ritalin and Concerta

Methylphenidate remains one of the most popular choices of medications for individuals with ADHD. However, the combination of dosing difficulties and negative side effects connected with oral administration left room for an alternate form of delivery: the methylphenidate transdermal delivery system, more commonly known as Daytrana. Currently, this medication is prescribed for children with ADHD and not adults, although it is sometimes prescribed off-label for adults with ADHD and related disorders.

If you are not familiar with Daytrana as a method of treatment for ADHD, you are not alone. It is a relatively new medication, introduced in 2006. It consists of the drug methylphenidate, the same chemical compound used in the more common ADHD medications Ritalin and Concerta. It is currently the only ADHD medication available in the patch form.

We will begin a series of posts exploring this new player in the world of ADHD, but I would like to start off with just providing a table of approximate dosing equivalents between Daytrana and the more common forms of methylphenidate, Ritalin and Concerta. A rough comparison, obtained from an article by Arnold and coworkers in the journal Pediatrics titled Treating Attention-Deficit/Hyperactivity Disorder with a Stimulant Transdermal Patch: The Clinical Art.

Please note that there are four different patch sizes of Daytrana currently available, which, based on the pharmacokinetics of a 6-12 year old child, correspond to four different doses of both the immediate release methylphenidate (note this 2nd-to last column corresponds to a Ritalin immediate release dose that given 3 times/day) and an osmotic-based release form of methylphenidate (Concerta). The patch is typically placed on the relatively inconspicuous location of the child's hip, and should be administered to the same site on a daily basis for consistency (different locations can actually affect the releasing dosage patterns of the patch)

Typical wear is for 9 hours, which is why the 9-hour dosing equivalents are given. However, the theoretical maximum dose per patch (which is the delivery rate times a 24-hour period) is also given. However, anything beyond a 9-hour dose is typically considered "off-label" use for Daytrana. These delivery rates of dosing for the different patch sizes are slower than the other forms of methylphenidate, as we will see in future posts. Nevertheless, I have included them to illustrate the patch size/dosing rate relationship for Daytrana. Note that the patch area and delivery rate follow a linear relationship, which is indicative of a uniform distribution of the drug across the surface of the patch which provides approximately 2.2 mg of methylphenidate content per square centimeter of patch area (over a 24 hour period).

We will be going into much more detail about the modes of action and functional differences of the Daytrana form of the drug methylphenidate (especially the differences between this patch form and the conventional "pill" form) as well as highlight some of the advantages and disadvantages of this new form of treatment for ADHD in the next few posts. Topics addressing the difficulties of an oral delivery system (we have hinted at some of the problems of food or drug metabolism and the ensuing consequences due to digestive issues such as celiac disease and ADHD symptoms) will also be discussed in the very-near future. In the meantime, a good overview of Daytrana, as evaluated by the FDA can be found here.

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Anonymous said...

My son has been on the Daytrana Patch for 1.5 months. He used to be on Focalin and Adderall but the side effects were not acceptable. What I don't like about Daytrana is the patch itself - it is itchy for my son - it leaves a red mark and glue marks when taken off - There are only so many "fatty" parts you can juggle between before it takes it's tole. It also came off when my son was at a water activity the entire day. It is not suppose to come off in water. I think there is a reason why the patch has not been used for kids. I am sad because I do really like the minor side effects - they are very light. I had no choice but to ask for a medication change after my son said he just couldn't deal with it anymore. I am going to try Concerta in a few days. Wish me luck !!

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