Drug:
AFRIN
Generic Name: Pseudoephedrine

Side effects: (11)

• nervousness
• restlessness
• dizziness
• difficulty sleeping
• upset stomach

• difficulty breathing
• fast or irregular heartbeat
• muscle weakness
• palpitations
• tremors
• hallucinations

Precautions: (8)
Before taking pseudoephedrine,

• tell your doctor and pharmacist if you are allergic to pseudoephedrine or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially medications for diet or appetite control, medications for asthma or high blood pressure, and vitamins. Do not take pseudoephedrine if you have taken an MAO inhibitor [phenelzine (Nardil) or tranylcypromine (Parnate)] in the last 2 weeks.
• tell your doctor if you have or have ever had high blood pressure, heart disease, kidney disease, glaucoma, diabetes, an overactive thyroid gland, or difficulty urinating (due to an enlarged prostate gland).
• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking pseudoephedrine, call your doctor.
• if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking pseudoephedrine.
• you should know that this drug may make you drowsy. Do not drive a car or operate machinery until you know how this drug affects you.
• remember that alcohol can add to the drowsiness caused by this drug.

Source:
Both sources are © copyright material and are from these two links

http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a682619.html#side-effects

http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a682619.html#precautions