Yes, the old theory used to be that only someone with a history of sever allergic reactions should use an epipen.
However currently it is the symptoms that dictate if an epipen should be used or not.
Pre hospital protocols no longer require the patient to have a known allergy.
Keep in mind that epipen should only be used if there is respiratory or circulatory compromise. Also, you should seek medical attention after using an epipen.