Musk Opens Up About Occasional Ketamine Use, Twitter's Rising Revenue

• Musk discussed his prescription ketamine use, saying it helps with his depression and he takes a small amount every couple weeks

• He said he's "almost always" sober when posting late at night on Twitter

• Musk denied overusing ketamine, saying he works 16-hour days and needs to stay mentally sharp

• He believes his depression is genetic and doesn't think his ketamine use impacts his companies

• Musk said Twitter's advertising and subscription revenues are rapidly rising despite some advertisers leaving over content concerns