Which medications are the best alternatives to stimulants in treatment of Adhd?

Similar mechanisms. All of the effective medications used to treat ADHD, even those billed as non stimulants, are actually are stimulants, such as atomoxitine, since they block the reuptake of nor epinephrine. Other effective alternatives include Provigil and Nuvigil, both of which are once a day medications and do not take long to begin to have a positive effect.
A few alternatives. By and large, stimulants are the first choice meds for ADHD. Younger age persons might be medicated with alfa 2 adrenergic agonists like clonidine and guanfacine. However, the next widely recommended alternative is atomoxetine, which acts very similarly to Norepinephrine reuptake inhibitors like bupropio. All these medications have a latency period of 2-3 weeks, and have to be taken daily.