It's important to know about the following medicines in case you have a problem. If you are allergic to aspirin, ask your doctor or pharmacist to make sure any new medicine you might take is not related to aspirin. This medicine is used for fever and pain. Very rarely, even acetaminophen may make asthma worse. If this happens to you, tell your doctor.
Antihistamines are safe for people with asthma to use, but they can cause side effects.
Some antihistamines can't be taken with certain other medicines. Before you start taking any new medicine, make sure your doctor or pharmacist knows which antihistamine you are taking. Beta blockers are drugs used to control blood pressure and heart disease. Sometimes they are given to people who have anxiety or headaches. All of the drugs in this group can make asthma worse.