How to Pamper Your Allergic Nose. Later last year I did a week long cleanse diet consuming only water, lemon juice, maple syrup, and cayenne pepper. How long do my allergy symptoms last? Sudafed works for me. However, newer antihistamines like Zyrtec and Claritin are less likely to cause this side effect. How to treat Ragweed Allergy? Claritin-D works best for me. Scientists estimate that a single ragweed plant can release one billion grains of pollen over the course of a single ragweed season. Living Donor Liver Donation. Air conditioners filter the air as well as cool it.