Is antihistamines first generation effective drug for common cold and does vitamin c important during common cold?

Antihistamines: Antihistamines help with runny nose, some nasal congestion, and watering of eyes. They do not help with severe nasal congestion, headache, fever, marked cough or fatigue. There is no conclusive evidence from research that Vitamin C helps ,once person becomes sick. If your diet includes citrus fruits, tomatoes, pineapple, water melon and mangoes, you are getting enough Vitamin C.

Vitamin C -yes! : antihistamines are better for allergies. Vitamin C, echinacea and zinc are helpful for colds, as is rest, hydration and taking it easy. This is your body's signal that you're under too much stress. It needs time to recharge & repair itself.

Probably not: Antihistamines are effective for sneezing and runny nose due to allergies, by blocking histamine receptors,. but can over dry nasal passages during colds. Atrovent nasal spray helps runny nose and decongestants (use Short term only) help congestion. Vitamin C may help prevent colds, but not as effective once you have one. Rest, fluids, chicken soup, zinc, humidifier, and netipot help.