Both Pseudovent and Sudafed have the same decongestant, pseudoephedrine. The Pseudovent has the maximum recommended dose of pseudoephedrine (120 mg) per 12 hours, so you shouldn't take them together.
You do have a chance of dying if you overdose on Pseudovent 400 capsules ETH. Any drug overdose can result in death.
I have a prescription for Psuedovent 400 and it says expires in 2 1/2 years.
the closest thing would be mucinex d, or take a combination of guaifenesin 400 mg (store brand generic) and store brand sudafed 12-hur...