What is the fastest way to get rid of a runny nose?

It all depends on what is causing the runny nose. You could use antihistamines.

Anti histamine

Or a drug called actifed (in the uk, don't know what it might be called in the us!) you can get it from a pharmacy.

It all depends on what is causing the runny nose. You could use antihistamines.

How do you know what's causing the runny nose?

If it is itchy and runny it is probably an allergy, in which case you need anti histamine. If you have a cold or infection you would probably have other symptoms like headache or soreness or lethargy, so actifed would work better.

If it is itchy and runny it is probably an allergy, in which case you need anti histamine. If you have a cold or infection you would probably have other symptoms like headache or soreness or lethargy, so actifed would work better.

I do have a cold, but what's actifed?