A pharmacist has revealed the biggest over-the-counter 'scam ... Sleep medications with diphenhydramine have also been shown to cause drowsiness, dizziness, headaches, dry mouth, and constipation ...

If you’re like most people, you’ll probably reach for some over-the ... “Certain medications for flu or cold can cause drowsiness, slower reaction times, or even dizziness,” warns James.

Some people use over-the-counter drugs to fall asleep faster ... Some sleep aids may also have unwanted side effects, such as dizziness. You may also become dependent on them to fall asleep.