Our expert says:
The Sinumax should have helped for the Post-Nasal drip, while the cough concoction should have helped if you had a tigh, phleghmy cough.
What you need would be a product containing an antihistamine (if you have Sinumax Allergy Sinus, that should be fine), other wise I suggest getting one. Demazin NS is a good option.
For the cough a soothing expectorant mixture such as Solphyllex or Alcophyllex mat be a better option.
All the best
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