Drug Name Viagra Chewable (Sildenafil) Drug Uses Viagra Chewable (Sildenafil) is another popular form of Viagra. Each Viagra Chewable contains 100mg of sildenafil citrate. The soft chewable tabs are easy to chew and swallow and are ideal for patients who do not like physically taking tablets. How to use Take Viagra Chewable (sildenafil) exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you. Take each dose with a full glass of water. Sildenafil is usually taken when needed. It can be taken anywhere from 4 hours to one-half hour before sexual activity. Generally, it is taken 1 hour before sexual activity. The medication can help achieve an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. Follow your doctor's instructions. Taking Viagra Chewable (sildenafil) after eating a high-fat meal (such as a cheeseburger and french fries) may cause the medication to take a little longer to start working. Do not take sildenafil more than once a day. If you develop dizziness, nausea, or angina (pain, tightness, discomfort, numbness, or tingling in the chest, arms, neck, or jaw) during sexual activity, refrain from further sexual activity and notify your doctor. Contact your doctor or seek emergency medical attention for any erection that lasts longer than 4 hours. A sustained erection can damage the penis. Grapefruit and grapefruit juice may interact with sildenafil. The interaction could lead to potentially adverse effects. You should discuss the use of grapefruit and grapefruit juice with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor. Drug Class and Mechanism Viagra increases blood flow to the penis, allowing more blood flow into the penis, like happened naturally, when a man is sexually stimulated. With more blood flowing in and less flowing out, the arteries in the penis enlarge, resulting in an erection. Missed Dose If you miss a dose of this medicine, take it as soon as possible. Do not take 2 doses at a time. Storage Viagra should be stored at room temperature, 15-30 degrees C (59-86 degrees F). Warnings/Precautions You should not use Viagra if you are taking organic nitrates for heart problems. Also, if you have serious heart problems, you should consult your doctor about the use of Viagra. You should use Viagra with caution if you have had a heart attack, stroke or arrhythmia, or if you have low blood pressure. Certain medications increase the blood levels of Viagra. These include: • erythromycin; • cimetidin; • saquinavir; • ritonavir; • ketoconazol; • itraconizol. Possible Side Effects If you experience any of the following serious side effects, stop taking Viagra and seek emergency medical attention or notify your doctor immediately: • an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives); • chest pain or an irregular heartbeat; • swelling of the ankles or legs; • shortness of breath; • prolonged or severe dizziness; • a prolonged (lasting longer than 4 hours) or painful erection; or • dizziness, nausea, or angina (pain, tightness, discomfort, numbness, or tingling in the chest, arms, neck, or jaw). Other, less serious side effects may be more likely to occur. Continue to take Viagra and talk to your doctor if you experience • flushing; • mild dizziness; • headache; • nasal congestion; • diarrhea; • temporary blue tint in vision or other vision abnormalities; or • itching or a rash. Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. More Information Drinking alcohol can temporarily impair the ability to get an erection. To get the maximum benefit from your medication, you are advised not to drink large amounts of alcohol before taking Viagra.