This product contains dextromethorphan. It is a cough suppressant that works by decreasing the feeling of needing to cough.Cough-and-cold products have not been shown to be safe or effective in children younger than 6 years.

Dextromethorphan can be found in many over-the-counter medications, so make sure you read package labels carefully. Don't use multiple products with dextromethorphan. Taking too much dextromethorphan can cause serious side effects, such as fast heartbeat, slow breathing, confusion, or seizures.

Check the medication label if you have phenylketonuria (PKU). You should not use dextromethorphan if you are allergic to it. Dextromethorphan should not be given to a child younger than 12 years old. Ask a doctor before using this medicine if you are pregnant or breast-feeding.

Delsym 12 Hour's powerful medicine uses a time-release formula that provides cough relief for up to 12 hours. Delsym Nighttime Cough Liquid provides multi-symptom relief and quiets cough to help you sleep.

Guaifenesin belongs to a class of drugs known as expectorants. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier. Dextromethorphan belongs to a class of drugs known as cough suppressants. It acts on a part of the brain (cough center) to reduce the urge to cough.

Delsym contains Dextromethorphan Polistirex, the active ingredient that helps quiet your cough by suppressing your cough reflex.

Dextromethorphan (Delsym) is a cough suppressant. It's usually well-tolerated. But it can cause mild side effects like nausea, dizziness, and drowsiness. More serious dextromethorphan side effects include serotonin syndrome.

Key takeaways: Some cough and cold medications - including oral decongestants and certain pain relievers - can increase blood pressure. Cough medications like Mucinex (guaifenesin) and dextromethorphan (Delsym, Robitussin), and antihistamines like diphenhydramine (Benadryl) aren't known to increase blood pressure.

It's similar or better than other cough relief medications that I've used before. I would recommend it if you are coughing. It works well and helps me sleep through the night or if you are sick.

Delsym has an average rating of 3.3 out of 10 from a total of 238 ratings on Drugs.com. 16% of reviewers reported a positive effect, while 69% reported a negative effect. Mucinex DM Maximum Strength has an average rating of 4.3 out of 10 from a total of 3 ratings on Drugs.com.

Slight drowsiness/dizziness, nausea, or vomiting may occur. Rarely, some people may experience severe drowsiness/dizziness with normal doses. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

What medication should I take if I have a cough or experiencing congestion? Over-the-counter medication, such as guaifenesin (Mucinex), pseudoephedrine (Sudafed) and dextromethorphan (Robitussin and Delsym), can help alleviate these symptoms.

Delsym has an average rating of 3.3 out of 10 from a total of 238 ratings on Drugs.com. 16% of reviewers reported a positive effect, while 69% reported a negative effect. Mucinex has an average rating of 6.1 out of 10 from a total of 151 ratings on Drugs.com.

Slight drowsiness/dizziness, nausea, or vomiting may occur. Rarely, some people may experience severe drowsiness/dizziness with normal doses. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Drink plenty of fluids when you use this medication unless otherwise directed by your doctor. The fluid will help loosen the mucus in your lungs. If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon.

If you have a history of high blood pressure, there are cold medications specifically designed for you. One such medication is Coricidin HBP and doesn't contain a decongestant. Another option for nasal congestion is to use nasal sprays which do not affect blood pressure.