Oxygen Labs Letrozole DropsOXYGENSLAB LETROZOLE DROPS(2. 5MG LETROZOLE ML=30ML) Active Life: Less than 24 hours Drug Class: Anti estrogen estrogen antagonist (Oral) Average Reported Dosage: 0. 5 2. 5 mg daily Acne: None Water Retention: No High Blood Pressure: Rare (not normally attributed to the drug itself) Liver Toxic: Yes Letrozole is a non steroidal selective third generation aromatase inhibitor, which is being sold under the brand name Femara by the international drug