What should my health care professional know before I take this medicine?
They need to know if you have any of the following conditions:
angina
kidney disease
an unusual or allergic reaction to prazosin, other medicines, foods, dyes, or preservatives
pregnant or trying to get pregnant
breast-feeding
How should I take this medicine?
Take prazosin by mouth. Swallow the tablet with a drink of water. Taking the tablet with food can help to reduce side effects. Take your doses at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on your prescriber's advice.
Contact your pediatrician or health care professional regarding the use of this medicine in children. Special care may be needed.
Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.
NOTE: This medicine is only for you. Do not share this medicine with others. What if I miss a dose?
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
What may interact with this medicine?
Do not take prazosin if you are taking the following medications:
other alpha-blockers such as alfuzosin, doxazosin, phentolamine, phenoxybenzamine, tamsulosin, terazosin
Prazosin may also interact with the following medications:
medicines for colds and breathing difficulties
medicines for high blood pressure
monoamine oxidase inhibitors
sildenafil (doses of sildenafil higher than 25 mg should be taken at least 4 hours apart from taking prazosin) tadalafil
vardenafil
water pills
Tell your prescriber or health care professional about all other medicines you are taking, including nonprescription medicines, nutritional supplements, or herbal products. Also tell your prescriber or health care professional if you are a frequent user of drinks with caffeine or alcohol, if you smoke, or if you use illegal drugs. These may affect the way your medicine works. Check with your prescriber or health care professional before stopping or starting any of your medicines.
