I got this info straight from the Drugs.com website regarding Sudafed:
What should I avoid while taking Sudafed?
Avoid taking diet pills, caffeine pills, or other stimulants (such as ADHD medications) without your doctor's advice. Taking a stimulant together with Sudafed can increase your risk of unpleasant side effects.
Do not use any other over-the-counter cough or cold medication without first asking your doctor or pharmacist. Pseudoephedrine is contained in many over-the-counter medications. If you take certain products together you may accidentally take too much of a certain drug. Read the label of any other medicine you are using to see if it contains pseudoephedrine.
I have taken adderal (amphetamine salts) before and it is also recommended that you avoid Vitamin C and fruit juices at the same time you take the med because it may cause you to absorb less of the medication.
As far as there being any amphetamine in sudafed I can't find anything that spells that out. I know it can cause a feeling of speediness in some people but that is probably because of the Pseudoephedrine it contains. That is the drug that people use to make Meth and most drugstores keep it behind the counter because of that.
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