Before taking this medicine. You should not use Contac Cold if you are allergic to Contac Cold. Do not use Contac Cold if you have used an MAO inhibitor in the past 14 days. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Singla on can you take 2 claritin: If your symptoms are not controlled with a normal dose, you should be evaluated for other causes and treatments. 2nd-generation antihistamines like Claritin (loratadine) are usually very safe, and we sometimes recommend doses higher. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Menchell on can i take claritin and dayquil: DayQuil contains PHENYLEPHRINE a DECONGESTION similar to SUDAPHED! Rapid heart beat and a number of other symptoms are possible! Hope this helps! Dr Z We can’t stress enough how important it is that you keep a record of any such medications that may affect your next drug screen. I suggest that you write a list of any medications you are taking prior to providing a sample specimen. cRc - Over The Counter Medicine List Cough See also 'Cold and Flu' Triaminic Day Time Cold and Cough Cherry Flavor Liquid Recommended Vicks Nyquil Cough Liquid Recommended The older, firstgeneration antihistamines, such as diphenhydramine (Benadryl, Nytol, Sominex), brompheniramine (Dimetapp), chlorpheniramine (Chlor-Trimeton) and doxylamine (Vicks NyQuil, Alka-Seltzer Plus) are effective in relieving allergic symptoms. Allergy, Asthma & Immunology Center is a practice dedicated to providing the latest and most up-to-date diagnostic treatment options in allergy and asthma care. Can Nyquil Show Up in a Drug Test? Nyquil is an over-the-country medication that is used to subdue common cold symptoms. As most of us who have taken the brand-name or generic version of Nyquil know, it’s a medication that should be taken at night because it can make you drowsy. Allergy Skin Testing – Medication List Important Information about Allergy Skin Testing: Patients scheduled for allergy skin testing must stop taking any medications that contain antihistamines Responsible for suppressing cough, one active medication in Dayquil and Nyquil is dextromethorphan. According to Drugs.com, side effects of this medication include nervousness, tremors, drowsiness and dizziness Additionally, 30 percent of those who take dextromethorphan report sleeplessness.