It's essential to use Femalegra 100 mg under medical supervision and to follow the dosage instructions provided by your healthcare provider. Like any medication, Femalegra 100 mg may cause side effects in some individuals, including headache, flushing, indigestion, and nasal congestion. Additionally, it can interact with certain medications or medical conditions, so it's crucial to discuss its use with a doctor to ensure it's safe and appropriate for you.