another name for this plant is Lodh Tree PDE inhibitors are used clinically for erectile dysfunction (PDE5i like Viagra), weight loss, and bronchodilation/asthma treatment. Symplocos Racemosa is one of nature’s most well-documented phosphodiesterase inhibitors. Phosphodiesterase is the enzyme responsible for breaking down cyclic-AMP (cAMP). cAMP is a second messenger that has beneficial effects like improved fat loss, increased muscle mass, improved thyroid function, and improved steroidogenesis. Indeed, the very reason forskolin works is because it increases levels of cAMP in the body by increasing levels of the enzyme that creates cyclic AMP.