I checked several web sites dealing with drug interaction and each site indicated no issues with taking all three together, however, pharmacy would not sell me Robitussin with my prescription for Tesalon Perls (Benzonatate)
24 Jul 2010
Your pharmacist may have felt that if you needed Robitussin your doctor would have also prescribed it...
Coughs are best treated with just one type of cough mixture / treatment at a time.
If the Benzonatate does not work then you could try the Robitussin.
All the best.
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