Excessive dosage may cause one to feel disoriented and lightheaded or experience headache or insomnia.

May have an effect on blood sugar.
– J Ethnopharmacol 1998 Jun;61(2):101-10 — Study of the anti-hyperglycemic effect of plants used as antidiabetics. — Alarcon-Aguilara FJ, Roman-Ramos R, Perez-Gutierrez S, Aguilar-Contreras A, Contreras-Weber CC, Flores-Saenz JL.

May stimulate sexual behavior.
– Psychopharmacology (Berl) 1999 Mar;143(1):15-9 — Stimulating property of Turnera diffusa and Pfaffia paniculata extracts on the sexual-behavior of male rats. — Arletti R, Benelli A, Cavazzuti E, Scarpetta G, Bertolini A.

Consider a mild diuretic, mild laxative, can cause contractions of the intestinal tract and may have testosterone-like effects.

Not recommended if you have gastrointestinal or kidney disorders
– Duke JA. CRC Handbook of Medicinal Herbs.– Boca Raton, FL: CRC Press, 1985, 492.