Phenyto S 100mg Tablet can be used alone or in combination with other medications It can be taken with or without food Your doctor will determine the appropriate dosage for you which may be gradually increased until your condition is stable It may take several weeks for the medication to take effect so it is important to take it regularly to receive its benefits Do not discontinue use unless advised by your doctor even if you feel fine Stopping the medication abruptly may result in an increased risk of seizures or worsening of bipolar disorder symptoms Common side effects of this medication include skin rashes headaches nausea difficulty sleeping dizziness and drowsiness Most of these side effects are temporary and will diminish over time However if they persist or bother you inform your doctor There may be methods to prevent or reduce these side effects Before taking this medication inform your doctor of any kidney or liver problems previous meningitis or depression or suicidal thoughts Additionally disclose all other medications you are currently taking as some may interact with or be affected by this medication including contraceptive pills If you are pregnant or breastfeeding Phenyto S 100mg Tablet may be taken if deemed necessary but the dosage may need adjustment If this medication causes drowsiness or dizziness it is advisable to avoid driving or riding a bicycle Regular blood tests may be required to monitor your response to the medication