It is important to tell a doctor or pharmacist what medicines the patient is already taking, including those bought without a prescription and herbal medicines, before starting treatment with this medicine. Similarly, check with the doctor or pharmacist before taking any new medicines while taking this one, to ensure that the combination is safe.
If this medicine is taken with other medicines that can reduce blood pressure, this effect may be enhanced, with an increased chance of dizziness or fainting. Other medicines that may reduce blood pressure include the following: anaesthetics; medicines for high blood pressure; other alpha blockers; phosphodiesterase type 5 inhibitors for impotence, eg sildenafil, vardenafil, tadalafil.