new/1533-1-6002.php Just be careful if it is Allegra-D (allegra and sudafed). Source(s):. Is it safe to mix dayquil sinus and dayquil cold and flu? Mixing dayquil with. Pour plus de renseignements, veuillez. Allegra 12 heures, 24 heures (fexofénadine). Allegra D. Dayquil Sinus and Pain Relief. **OR Copy and Paste a Link into a Browser Address Bar: p> | ||||||
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