A Phase IV trial is also known as postmarketing surveillance trial, or informally as a confirmatory trial . Phase IV trials involve the safety surveillance ( pharmacovigilance ) and ongoing technical support of a drug after it receives permission to be sold (. after approval under the FDA Accelerated Approval Program ).  Phase IV studies may be required by regulatory authorities or may be undertaken by the sponsoring company for competitive (finding a new market for the drug) or other reasons (for example, the drug may not have been tested for interactions with other drugs, or on certain population groups such as pregnant women, who are unlikely to subject themselves to trials).   The safety surveillance is designed to detect any rare or long-term adverse effects over a much larger patient population and longer time period than was possible during the Phase I-III clinical trials.   Harmful effects discovered by Phase IV trials may result in a drug being no longer sold, or restricted to certain uses; recent examples involve cerivastatin (brand names Baycol and Lipobay), troglitazone (Rezulin) and rofecoxib (Vioxx). The minimum time period mandatory for Phase IV clinical trials is 2 years. [ citation needed ]
Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.
Equipoise can produce androgenic side effects such as acne, accelerated hair loss in those predisposed to male pattern baldness and body hair growth. However, the overall androgenicity of this steroid is greatly reduced due to the structural nature that creates EQ in its double bond at the carbon one and two position. Such side effects of Equipoise are still possible, but they will be strongly linked to genetic predisposition, but most will find the threshold is fairly high.
When combating the possible androgenic side effects of Equipoise, it’s important to note they are brought on by the steroid being metabolized by the 5-alpha reductase enzyme. This metabolism will reduce Boldenone to an extremely potent androgen in dihydroboldenone, far more potent than dihydrotestosterone (DHT); however, the total dihydroboldenone activity has proven to be extremely low in human beings. You will further find the androgenic nature of Boldenone will not be significantly affected by 5-alpha reductase inhibitors like Finasteride that are often used to combat the reduction to DHT.
Due to the androgenic nature of Equipoise, women may potentially experience virilization symptoms. Virilization symptoms may include body hair growth, a deepening of the vocal chords and clitoral enlargement. However, the low androgenicity will make this steroid possible to use for some women without such symptoms. At the same time, the extremely slow acting nature of the compound can make it difficult to control regarding blood levels, and alternative steroids may be preferred. Without question, individual sensitivity will dictate a lot. If Equipoise is used and virilization symptoms begin to show, use should be discontinued immediately at their onset and they will fade away. If symptoms begin to show and are ignored, the symptoms may become irreversible.