There are currently no studies or guidelines that recommend the combined use of Vyvanse and Concerta together. However, in practice, there are some providers that do prescribe and dose two different stimulant medications to their patients for daily use based on response and efficacy. When this occurs, most commonly an extended release medication (like Concerta) is prescribed for daily coverage and an immediate release product (e.g. Adderall), is prescribed during the day to be used as needed (i.e. as a "booster").
Combining Vyvanse And Concerta
It would be relatively uncommon for two long acting ADHD stimulants, like Vyvanse and Concerta to be prescribed together but there certainly could be individual cases where the combination is safe end effective for use. It's highly individualized and you should speak to your doctor regarding your options. Most often though, a stimulant is combined with a non-stimulant medication to attain complete coverage of symptoms.
While not completely akin to using two long acting stimulants, current research shows that the combination of two ADHD medications (in different medication classes) can be far more effective than a single agent. For example, guanfacine combined with Focalin (dexmethylphenidate) showed more consistent benefit for ADHD symptoms than either agent alone. Another study showed that the combination of Strattera (Atomoxetine) and different amphetamine stimulants were more effective that a single agent for certain individuals.
Choice of medication(s) for the treatment of ADHD and other co-morbid conditions (i.e. the presence of other diseases such as ADHD with anxiety) is highly individualized. While the use of two stimulant medications isn't unheard of, it is not common. Generally, the combination of a stimulant and non-stimulant medication is more often used to appropriately treat all symptoms and conditions.