SN instructed patient / caregiver that Hydralazine medication relaxes and expands blood vessels and is used to treat high blood pressure ( hypertension ). SN explained to patient / caregiver that side effects of this medication includes: dizziness, drowsiness, headache, constipation, loss of appetite, fatigue and nasal congestion may occur as your body adjusts to the medication. SN explained to patient / caregiver that to avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. SN instructed patient / caregiver to inform doctor if you develop: chest pain, muscle pain, swelling of the hands or feet, yellowing of the eyes / skin, joint pain, a change in the amount of urine. SN explained to patient / caregiver that this drug may cause numbness or tingling of the fingers and toes and that if this occurs, notify doctor. SN explained to patient / caregiver that symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing and should be reported immediately for prompt treatment.