I need allergys meds need a negative drug test my allergies are killing me can I take Benadryl (diphenhydramine) or zrtek?

Antihistamine. Benadryl (diphenhydramine) use is DANGEROUS if you intend to drive. Zyrtec, Loratidine etc are safer choices. Best if taken at night time so that you awake without allergy symptoms.

Related Questions

I just drank a bottle of sake but my allergies are killing me and I can't sleep. Would it be safe take to take Benadryl (diphenhydramine)?

Yes if sober. And have no other contraindication for benadryl, (diphenhydramine) take the lowest dose, if no improvement call your doctor.
Alcohol and sleep. Alcohol depresses the central nervous system (CNS). I would not recommend taking any other CNS depressant on top of alcohol. I would not advise taking benadryl (diphenhydramine) after drinking a bottle of sake.