sildenafil citrate doses range from 25 milligrams to 100 milligrams, depending on the drugs effect. the usual sildenafil citrate dose is 50 milligrams. if you are over 65, have liver or kidney problems, or are taking erythromycin, ketoconazole, itraconazole, ritonavir, or saquinavir a dose of 25 milligrams may be sufficient. your doctor will adjust the dosage if the drug is not working properly for you.

take sildenafil citrate only before sexual activity. the manufacturer recommends a maximum of 1 dose per day (1 dose every 2 days for those taking ritonavir).

overdosage of sildenafil citrate: no overdose of sildenafil citrate has been reported. however, any medication taken in excess can have serious consequences. if you suspect an overdose, seek medical attention immediately.

if you miss a dose of sildenafil citrate: sildenafil citrate is not for regular use. take it only before sexual activity.

storage instructions for sildenafil citrate: keep this medication in the container it came in, tightly closed, and out of reach of children. store it at room temperature and away from excess heat and moisture (not in the bathroom). throw away any medication that is outdated or no longer needed.

preparations of sildenafil citrate: 25mg, 50mg, 100mg

side effects of sildenafil citrate cannot be anticipated. if any develop or change in intensity, inform your doctor as soon as possible. only your doctor can determine if it is safe for you to continue taking sildenafil citrate.

more common side effects of sildenafil citrate: may include abnormal vision (color tinge, blurring, sensitivity to light) acid indigestion, diarrhea, flushing, headache, nasal congestion, urinary tract infection.

less common to rare side effects of sildenafil citrate: may include, abdominal pain, abnormal dreams, abnormal ejaculation, allergic reactions, anxiety, asthma, bloodshot eyes, bone pain, breast enlargement, cataracts, chest pain, chills, coordination problems, cough, depression, difficulty in breathing, difficulty in swallowing, dilated pupils, dizziness, drowsiness, dry eyes, dry mouth, emotional or mental disturbances, eye inflammation or pain, other eye disorders, fainting, falling, genital problems, gout, gum inflammation, heart problems, increased night-time urination, increased pressure in the eyes, insomnia, itchy skin, joint disease, light sensitivity, loss of bladder control (urinary incontinence), low blood pressure, migraine headache, muscle ache, numbness, oral inflammation, pain, painful erection, prolonged erection, raised skin patches, rapid or throbbing heartbeat, rectal bleeding, respiratory inflammation, ringing in the ears, seizure, sinus and throat inflammation, skin rash, skin ulcer, slow reflexes, stomach or intestinal inflammation, sweating, swelling, thirst, tremor, vomiting, weakness.

major side effects of sildenafil citrate: may include heart attack, stroke, heart irregularities, dangerous surges in blood pressure, and sudden death have all been reported after use of sildenafil citrate, usually in men with existing cardiac risk factors, and typically during or shortly after sex.


why should sildenafil citrate not be prescribed?
do not take sildenafil citrate if you are taking any nitrate-based drug, including nitroglycerin patches (nitro-dur, transderm-nitro), nitroglycerin ointment (nitro-bid, nitrol), nitroglycerin pills (nitro-bid, nitrostat), and isosorbide pills (dilatrate-sr, isordil, sorbitrate). combining sildenafil citrate with these drugs can cause a severe drop in blood pressure. if sildenafil citrate gives you an allergic reaction, do not use it again.

special warnings about sildenafil citrate:

• if you have heart problems severe enough to make sexual activity a danger, you should avoid using sildenafil citrate. use it cautiously---if at all---if you ve had a heart attack, stroke, or life-threatening heart irregularities within the past 6 months. be equally cautious if you have severe high or low blood pressure, heart failure, or unstable angina (crushing heart pain that occurs at any time).
  
  
• if you take sildenafil citrate and develop cardiac symptoms (for example, dizziness, nausea, and chest pain) during sexual activity, do not continue. alert your doctor to the problem as soon as possible.
  
  
• if you have a condition that might result in long-lasting erections, such as sickle cell anemia, multiple myeloma (a disease of the bone marrow), or leukemia, use sildenafil citrate with caution. also use cautiously if you have a genital problem or deformity such as peyronie s disease. if an erection lasts more than 4 hours, seek treatment immediately. permanent damage and impotence could result.
  
  
• if you have a bleeding disorder, a stomach ulcer, or the inherited eye condition known as retinitis pigmentosa, use this medication with caution. its safety under these circumstances has not yet been studied.
  
  remember that sildenafil citrate offers no protection from transmission of sexually transmitted diseases, such as hiv, the virus that causes aids.