What are some natural remedies for constant drainage down the throat?

Gargle with Salt Water

Gargling with salt water is one of the best home remedies to ease the discomforts of post-nasal drip. It helps thin the mucus, making it easier for you to get rid of it. It also flushes the irritants out of the nasal passages.

Add ½ teaspoon of salt to 1 cup of warm water.
Stir thoroughly until the salt dissolves.
Gargle with this solution a few times daily for 2 to 3 days.

Steam Inhalation

Use steam treatments, with or without essential oils, to control excess mucus production that causes post-nasal drip.

Make a bowl of hot, boiling water.
Optionally, add a few drops of any essential oil.
Drape a towel over your head and hold your face over the hot water.
Deeply inhale the steam for about 10 minutes, then blow your nose.
Do this 2 or 3 times daily until you recover completely.
You can even take warm showers to help break up the mucus.

Nasal Irrigation

Nasal irrigation also helps clear up excess mucus. It even helps keep the nasal passages free from irritants and prevents further infection.

Add ¼ teaspoon of salt and a pinch of baking soda to 1 cup of warm distilled water.
Fill a neti pot with this solution.
While standing over a sink, tilt your head to one side and squirt the solution into one of your nostrils.
Move your head back, forward and side-to-side to help the solution reach your nasal cavities.
Blow your nose to remove excess mucus and solution.
Repeat the process with the other nostril.
Do this once daily for a few days and then a few times a week.