Anavar is a very mild anabolic steroid that carries a few possible side effects. Of the most noteworthy side effects, DHT-related are the most common. Anavar cannot cause Gynecomastia or lead to excess water retention as it simply does not aromatize. Many athletes take aromatase inhibitors in conjunction with their anabolic steroids to keep estrogen levels under control. Anavar side effects are not due to estrogen, however, so this is not a necessary precaution. Anavar can increase blood pressure and cholesterol levels, but is very rare in healthy individuals who supplement responsibly.