Viagra is a drug used to treat male impotence. Viagra is designed to stimulate blood flow to the penis during sexual intercourse, thus aiding in achieving an erection. The medication is usually taken at least 30 minutes before sexual activity, notes FamilyDoctor.org. Viagra is available in 25 mg, 50 mg and 100 mg tablets. Doctors highly recommend refraining from taking more than one Viagra tablet within a 24-hour period. It is also highly recommended not to exceed the dosage prescribed by a medical professional, explains FamilyDoctor.org.
Altered Sense of Vision or Loss of Vision
Using Viagra excessively can alter vision, according to FamilyDoctor.org. Everything may appear bluish, or vision may be lost altogether, notes MedlinePlus. However, altered vision is the least common side effect of Viagra. During a clinical trial conducted prior to the drug's launch, noted Drugs.com, this side effect occurred in fewer than 2 percent of clinical trial participants who took the recommended dose.
Insomnia
Using Viagra excessively can cause sleeping problems, explains MedlinePlus. However, the side effect may be related to dosage. Making adjustments to the dosage may alleviate this side effect, notes Drugs.com.
Loose Bowel Movement
Excessive Viagra use can cause loose bowl movement, or diarrhea, notes Drugs.com. However, this occurred in fewer than 3 percent of clinical trial participants.
Loss of Hearing
Excessive Viagra use can also cause temporary partial or total hearing loss, notes MedlinePlus. The hearing loss usually affects one ear, but may affect both ears.
Muscular Pain and Numbness
Using Viagra excessively may sometimes cause muscular pain, notes MedlinePlus. It is also possible for Viagra to cause numbness or a prickling sensation in the upper and lower extremities.
Nausea and Abdominal Pain
Viagra can cause nausea or pain in the abdominal region when taken excessively, notes Drugs.com. However, these side effects occurred in fewer than 2 percent of clinical trial participants who took Viagra at the recommended dose and rate of frequency, explains Drugs.com.
Painful Erection and Urination
The excessive use of Viagra can cause pain during urination and erection. This generally occurs when the erection is sustained for more than four hours. It is also possible to experience a burning sensation when urinating, notes Drugs.com.
Warmth and Redness of the Face Upper Section of the Body
Using Viagra excessively can also cause a warm sensation and redness to spread across the face and upper section of the body, notes MedlinePlus. This is known as flushing, and has occurred in about 10 percent of clinical trial participants, according to Drugs.com.
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