This is the medication Promethazine/Codeine, a powerful opiate drug used to treat severe coughing. It is not for use by those under 16 years of age, or those with breathing difficulty, as it can cause serious or fatal side effects while suppressing the cough reflex.
It is only prescribed when repeated chronic coughing threatens to cause lung damage.
(See the related link for side effects and contra-indications.)
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