It increases secretions (mucus that is coughed out). Mucinex is generally safe for adults and children over age 2. However, ...

Guaifenesin 100mg; per 5mL; grape flavor; alcohol free; contains sodium 3mg. <4yrs: do not use. 4–5yrs: 2.5–5mL every 4 hours. 6–11yrs: 5–10mL every 4 hours. Max 6 doses/day.

Guaifenesin 50mg; per packet; grape flavor; contains (phenylalanine 0.6mg, magnesium 6mg) per packet. Empty entire contents of packet onto tongue and swallow. Do not chew. <4yrs: do not use. 4 ...