Suppressant (noun)

A substance or agent used to suppress or restrain something, such as an appetite or a cough.

Origin:

From the verb "suppress" + the noun "-ant" (one that performs a particular action).

Examples:

1. The doctor prescribed a suppressant to help her quit smoking.
2. The suppressant helped him control his appetite and eat less.
3. She took a suppressant to help her overcome her addiction to junk food.
4. The suppressant was effective in reducing the frequency and severity of his coughing spells.
5. Many dieters use suppressants to help control their eating habits and lose weight.