http://www.medications.co.uk/se/Robitussin+PM+Cough+%26+Cold Recent side effects for Robitussin PM Cough & Cold Tue, 02 Oct 2007 13:51:56 -0400 http://www.medications.co.uk/effect/view/24060 I took this drug before bed one night and within 2 hours I woke up with a swollen throat and tongue. I had to go to the hospital to get a shot of Benadryl for an allergic reaction. I have taken other Robitussin cough syrups before, but this particular br http://www.medications.co.uk/effect/view/24060