Pseudoephedrine, a medicine found in many cold and flu medicines like Sudafed, can trigger tremors ... most commonly prescribed steroids in the UK. It can cause serious side effects, such as ...

Acetaminophen 250mg, dextromethorphan HBr 10mg, guaifenesin 100mg, pseudoephedrine HCl 30mg; per liquid cap. See Contraindications. Increased risk of liver damage with ≥3 alcoholic drinks/day ...

Acetaminophen 325mg, phenylephrine HCl 5mg; per caplet. See Contraindications. Increased risk of liver damage with ≥3 alcoholic drinks/day. Hypertensive crisis with MAOIs. β-blockers may ...

Phenylephrine is used in popular versions of Sudafed, Dayquil, and other medications. It has been sold for more than 75 years, predating the agency’s own regulations on drug effectiveness.