Standard Vyvanse Dosage. In most cases, a doctor will start the patient off with a 30mg dose each day. If there is no change in the patient’s ADHD symptoms, the dosage may then be increased in increments of 10mg to 20mg up to a maximum daily dosage of 70mg once daily. Dosages are normally evaluated on a weekly basis. These dosages apply to all patients from the age of six years and up.