The effects of taking Trenbolone Enanthate may continue once the user has stopped taking the steroid. The drug suppresses the natural production of testosterone by the user as it alters the Hypothalamus-Pituitary-Testes-Axis (HPTA). This is the area which is responsible for production of the two gonadal hormones that trigger the production of testosterone in the testicles. The effect of Trenbolone Enanthate on the HPTA can be very severe. It may take some time for the Axis to recover and it could require medical advice and hormone treatment before the normal production of testosterone can begin again.