 [ Symptoms ] my mother has diabetes she currently has allergies and a runny nose what can she take [ Disease ] allergy symptoms such as a runny nose are best treated with an antihistamine like chlorpheniramine chlor trimeton antihistamines are safe for people with diabetes to use i would not recommend any products that contain pseudoephedrine or phenylephrine such as sudafed or sudafed pe these medications may increase blood pressure which can be a concern for someone with diabetes using pseudoephedrine or phenylephrine for only a couple of days may not be a problem but avoiding them all together is the safest route