Oreton is a fast-acting oil-based testosterone. Oreton is very similar to Depo-Testosterone except it is only effective in the system for about five days. Therefore shots are taken twice a week. Oreton can be effective for size and strength gains like other testosterones and it does cause a number of side effects. Gynecomastia, water retention, and aggression are most common. Few athletes use Oreton anymore mainly because it is not nearly as available as other testosterones. Others do not care for the frequent shots that are required even though they think the drug has similar effects to Depo-Testosterone. Average Oreton dosages are in the range of 200mg to 400mg per week.