The contraceptive pill Diane-35 does not cause weight gain. In some cases, it may cause water retention, but this is usually mild and temporary. The duration of treatment with Diane-35 can be as long as necessary. It is recommended to continue the treatment for 2 cycles after achieving the desired results before considering stopping the medication. While there is a potential for complications such as stroke or thromboembolism, the absolute risk is very low. Other factors like obesity, smoking, and certain medical conditions can also increase the risk. Overall, using Diane-35 for acne control is considered safe, but if the sole purpose is contraception, there are other options available with lower estrogen doses that may be more suitable.