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Like with any other prescription medication, Viagra can cause some side-effects even if taken exactly as indicated by the doctor. Side-effects are rarely reported. But in any case, take not of the following symptoms, which may occur when taking Viagra:
More common
- stomach upset
- headache
- flushing
Less common
issues with vision such as blurred vision, increased sensitivity to light
pain in the bladder or during urination
bloody or cloudy urine
dizziness
diarrhea
Rare
eye bleeding
seizures
blindness or severe vision problems
priapism (prolonged erection that is painful and won’t go off)
eye swelling, redness or burning
anxiety
Certain medications can affect the way Viagra works in the body. Because of that, it is recommended that you avoid taking certain drugs when taking Viagra. In fact, some medications can interact with Viagra causing sever illness or even risk to life. You should inform your doctor if you are taking any of the following drugs before starting a course of Viagra:
- Protease Inhibitors (Crixivan, Invirase, Norvir, Viracept, Fortovase, Agenerase, Lopinavir). These medications increase the blood concentration of Viagra, thus prolonging its action. In this case a smaller dose is of Viagra recommended.
- Cimetidine (Tagamet)
- Erythromycin (E.E.S. or Ery-Tab)
- Itraconazole (Sporanox)
- Ketaconazole (Nizoral)
- Mibefradil (Posicor)
- Nitrates/Nitroglycerin (Nitrostat or Transderm-Nitro). Mixing Sildenafil with nitrate containing dugs results in excessive lowering of blood pressure. Avoid using sildenafil when taking nitrates for it may result in life-threatening conditions.
Certain medical conditions impose Viagra to be taken with much caution. Some conditions even prohibit taking Viagra. The following medical conditions should be told about to your doctor before starting a course of Viagra.
- Arrhythmia
- HIV/AIDS
- Coronary artery disease
- History of heart attack or stroke
- Blood pressure issues
- Abnormal penis shape, including curved penis and birth defects of the penis
- Bleeding problems
- Retinitis pigmentosa (disorder of the retina)
- Thickened blood or slower blood flow causing conditions like leukemia, multiple myeloma (bone marrow tumors), or polycythemia, sickle cell disease, and thrombocythemia (blood problems)
- Priapism (abnormal prolonged erection)
- Heart or blood diseases
- Kidney or liver diseases
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