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Well, the fact that your doctor took you off from a psychostimulant drug such as Methylphenidate and had put you on Strattera ( atomoxetine) , which is a non stimulant drug , also used in the treatment of ADHD, was not a wise decision, as it would have been better, if he had chosen another psychostimulant such as Adderall ( Amphetamines ) instead, as it is better than non stimulants such as strattera , and also has a faster action. Also, the usual practice is to first use a non stimulant for ADHD, such as Strattera , and when this drug is not effective , then we put the patient on Psychostimulants such as Adderall , ritalin, focalin, etc , So, if you see, in your case it is the opposite that has been done , as you have been shifted from a much stronger drug to the less stronger one.
However, now that you have been placed on strattera, you shall continue it for at least 3-4 weeks, because this drug requires atleast 3 weeks to show its effect in ADHD . But, if after 4 weeks , there is not much help from strattera , then i suggest that you talk to your doctor and get swithched onto Adderall. You can switch to Adderall even now also, but then , after stopping strattera , you will again have to wait for 2 weeks or so, for the drug to get cleared from your system completely and only after that you may start Adderall.
So, i have given you two options -- one is to continue on strattera for atleast 3-4 weeks and wait for its action to take place and second option is to stop strattera , wait for 2 weeks so that the drug clears from your system and then start on Adderall. If you choose to continue on strattera , then for your irritability you may take clonazepam , an anti anxiety drug , which has no adverse interaction with strattera.
As for , vyanese is concerned , no doubt it is very effective in ADHD , but it causes insomnia as a side effect, which may add to your anxiety.So, instead if at all you choose to start on a psychostimulant , i would recommend you start on Adderall , and second option would be focalin.
I hope my answer serves your query according to your satisfaction.