Yes, Phenylephrine is safe for most of the patients. However, in some patients, it may cause side effects like nausea, vomiting, headache, fatigue, dizziness, dryness in the mouth, sleepiness and allergic reaction. If you experience any persistent problem while taking this medication, inform your doctor as soon as possible.

Yes, the use of Phenylephrine can cause dizziness (feeling faint, weak, unsteady or lightheaded) in some patients. If you feel dizzy or lightheaded, it is better to rest for sometime and resume once you feel better. Do not drive or use any machines. Consult your doctor if the side effect persist or worsen.

Yes, the use of Phenylephrine can cause nausea and vomiting. To avoid nausea one can take Phenylephrine with milk, food or with antacids. If vomiting occurs, drink plenty of water or other fluids. Talk to your doctor if vomiting persists. You should let your doctor know if you are unable to drink water and there are signs of dehydration, like dark colored and strong-smelling urine and a low frequency of urination. Avoid taking fatty or fried foods along with this medication. Do not take any other medicine without consulting your doctor.