Nothing specifically re: Testiviron, it's marketed in the US as testosterone enathate it's one of the more prescribed versions of IM T. Take under care of physician under guidelines he or she prescribes. Get frequent blood tests for blood count, cholesterol, liver enzymes, and t levels (perhaps twice a year after you have started). T is safe and effective if given as prescribed.
Most common adverse effects: weight gain, acne, elevated blood pressure, and cholesterol, and high red blood count. It's not specific to type of T. The only bad kind of T is oral. Never take T orally as it is almost guaranteed to raise your liver enzymes badly.
--Jay