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Well first of all high amounts of any type of cough syrup will back fire on you and cause you to have the reverse effect. The thinking that if one dose is good, that more than one dose is even better doesn't work with cough syrups. Tend to make you jittery and sleeplessness can occur. of course mixing Valium with the antihistimines and other ingredients in cough syrups is probably not a great idea, but you would probably be ok if a small dosage of Valium. But this combination probably wouldn't have a pleasant effect.

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14y ago

What else can I help you with?