Codeine:
>10%:
Central nervous system: Drowsiness
Gastrointestinal: Constipation
1% to 10%:
Cardiovascular: Hypotension, palpitations, tachycardia or bradycardia,
peripheral vasodilation
Central nervous system: CNS depression, sedation, confusion, headache,
increased intracranial pressure, dizziness, lightheadedness, false feeling of
well being, restlessness, paradoxical CNS stimulation, malaise
Dermatologic: Skin rash, urticaria
Endocrine & metabolic: Antidiuretic hormone release
Gastrointestinal: Nausea, vomiting, anorexia, dry mouth, biliary spasm
Genitourinary: Decreased urination, urinary tract spasm
Neuromuscular & skeletal: Weakness
Ocular: Miosis, blurred vision
Respiratory: Respiratory depression, dyspnea
Miscellaneous: Histamine release, physical and psychological dependence with
prolonged use
<1%:
Central nervous system: Convulsions, hallucinations, mental depression,
nightmares, insomnia
Gastrointestinal: Stomach cramps, paralytic ileus
Neuromuscular & skeletal: Trembling, muscle rigidity
Guaifenesin: 1% to 10%:
Central nervous system: Drowsiness, headache
Dermatologic: Rash
Gastrointestinal: Nausea, vomiting, stomach pain