Pregnancy and breast-feeding: Not enough is known about the use of purple nut sedge during pregnancy and breast-feeding. Stay on the safe side and avoid use.

Bleeding disorders: Purple nut sedge might slow blood clotting. This might increase the risk of bruising or bleeding in people with bleeding disorders.

Slow heart rate (bradycardia): Purple nut sedge might slow down the heartbeat. This could be a problem in people who already have a slow heart rate.

Diabetes: Purple nut sedge might lower blood sugar levels. People with diabetes should monitor their blood glucose levels closely. If you have diabetes, it’s best to check with your healthcare provider before starting purple nut sedge.

Gastrointestinal tract blockage: Purple nut sedge might cause “congestion” in the intestines. This might cause problems in people who have a blockage in their intestines.

Stomach ulcers: Purple nut sedge might increase secretions in the stomach and intestines. There is concern that this could worsen ulcers.

Lung conditions: Purple nut sedge might increase fluid secretions in the lung. There is concern that this could worsen lung conditions such as asthma or emphysema.

Seizures: There is concern that purple nut sedge might increase the risk of seizures.

Surgery: Purple nut sedge might lower blood sugar or slow blood clotting. There is some concern that it might interfere with bleeding or blood sugar control during surgery. Stop using purple nut sedge at least 2 weeks before a scheduled surgery.

Urinary tract obstruction: Purple nut sedge might increase secretions in the urinary tract. There is concern that this could worsen urinary obstruction.