You are safe to take Robitussion Dm and Coricidin HBP, depending on your symptoms. In fact for someone who is 40 and has glaucoma, most cold remedies are safe since you are very very unlikely to have angle closure glaucoma at such a young age. That kind of glaucoma is what the medications always allude to but they simply state ask your doctor since people dont know what kind of glaucoma they have. Angle closure glaucoma usually affects older folks, if you are treated for glaucoma and your doc never had to do a laser for it, you are probably safe. Hope this helps.