Can I give Desalex back to my son with a cough?

Hello my son is very cough he has 6 months, and the doctor prescribed DESALEX ONCE A DAY, I gave the 14hs and his crisis happened, but when a break of 8hs his cough comes back and he does not sleep and already it's 10:00 pm, can I give it again?
Expert answer:

No, you must follow your doctor's prescription. This medicine is indicated for use in a single daily dose.

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