Common Headache, Nausea, Vomiting, Sleepiness, Dryness in mouth, Dizziness, Blurred vision, Itching, Paresthesia (tingling or pricking sensation), Nystagmus (involuntary eye movement), Tremor, Decreased blood pressure, Euphoria (feeling of intense excitement and happiness), Uncoordinated body movement, Altered taste, Ringing in ear, Slurred speech.

Expert advice for Fosentin Injection
Fosentin should be taken at the same time every day to maintain consistent levels in your body. Do not stop using Fosentin without talking to your doctor, even if you feel better. It causes sleepiness or drowsiness. If this happens to you, do not drive or use machinery. Avoid consuming alcohol when taking the Fosentin, as it may cause excessive sleepiness or drowsiness. It may increase blood sugar levels.Inform your doctor if you are taking any medicines to treat diabetes. Do not start any medicine including herbal or ayurvedic without telling your doctor. As it may significantly change the Fosentin levels. Inform your doctor if you have ever been diagnosed with kidney or liver problems. Inform your doctor if you are pregnant or planning to conceive or breastfeeding.

Q. Is fosphenytoin a vesicant?
Yes, fosphenytoin is a vesicant

Q. Why is fosphenytoin better than Dilantin?
Dilantin is a brand name of phenytoin. Fosphenytoin does not have side effects which are commonly associated with the use of phenytoin (when injected intravenously or intramuscularly) such as injection site irritation and sudden changes in the heart rate (arrhythmia), hence fosphenytoin is better than Dilantin.