Kirkland Signature Mucus Relief is an over-the-counter expectorant containing guaifenesin 400 mg per immediate-release tablet. This medication helps relieve chest congestion by thinning and loosening mucus, making coughs more productive and helping clear bronchial passageways of bothersome mucus. The package contains 2 bottles with 200 tablets each for a total of 400 tablets.

Guaifenesin works by increasing respiratory tract fluid secretions, reducing the viscosity of mucus and facilitating its removal through coughing. The tablets are film-coated and scored in the middle for easy splitting if needed. This product is comparable to the active ingredient in Mucinex but at a lower cost. Recommended dosage is one tablet every 4 hours as needed, with a full glass of water to enhance effectiveness. The product should be used within 6 months of opening.