Organization and nature of operations	9 Months Ended
Sep. 30, 2019
Organization and nature of operations
Organization and nature of operations	1 Organization and nature of operations Milestone Pharmaceuticals Inc. (Milestone or the Company) is a Phase 3 clinical-stage biopharmaceutical company incorporated under the Business Corporations Act of Quebec. Milestone is dedicated to developing and commercializing etripamil for the treatment of cardiovascular indications. Etripamil is a novel, potent short-acting calcium channel blocker that the Company designed and is developing as a rapid-onset nasal spray to be administered by the patient to terminate episodes of paroxysmal supraventricular tachycardia as they occur. Reverse stock split On April 26, 2019, the Company’s Board of Directors approved an amendment to the Company’s articles of incorporation to effect a 1-for-5.3193 reverse stock split of the Company’s common shares, convertible preferred shares and the share options of the Company. Accordingly, all common shares, convertible preferred shares, share options and per share amounts in these unaudited interim consolidated financial statements have been retroactively adjusted for all periods presented to give effect to the reverse stock split. The reverse stock split was effected on April 26, 2019. Initial Public Offering On May 13, 2019, the Company completed its initial public offering ("IPO"), whereby the Company issued 5,500,000 common shares at a public offering price of $15.00 per share. The shares began trading on The Nasdaq Global Select Market on May 9, 2019. On May 15, 2019, the underwriters fully exercised their option to purchase an additional 825,000 common shares at the public offering price of $15.00 per share. The gross proceeds received by the Company from the offering were $94.9 million, before deducting underwriting discounts and commissions and other estimated offering expenses payable by the Company. Upon the closing of the IPO, 24,490,742 common shares were outstanding, which included all outstanding shares of Class A1, A2, B, C, D1 and D2 preferred shares that converted into 17,550,802 common shares.

1 Organization and nature of operations

Milestone Pharmaceuticals Inc. (Milestone or the Company) is a Phase 3 clinical-stage biopharmaceutical company incorporated under the Business Corporations Act of Quebec. Milestone is dedicated to developing and commercializing etripamil for the treatment of cardiovascular indications. Etripamil is a novel, potent short-acting calcium channel blocker that the Company designed and is developing as a rapid-onset nasal spray to be administered by the patient to terminate episodes of paroxysmal supraventricular tachycardia as they occur.

Reverse stock split

On April 26, 2019, the Company’s Board of Directors approved an amendment to the Company’s articles of incorporation to effect a 1-for-5.3193 reverse stock split of the Company’s common shares, convertible preferred shares and the share options of the Company. Accordingly, all common shares, convertible preferred shares, share options and per share amounts in these unaudited interim consolidated financial statements have been retroactively adjusted for all periods presented to give effect to the reverse stock split. The reverse stock split was effected on April 26, 2019.

Initial Public Offering

On May 13, 2019, the Company completed its initial public offering ("IPO"), whereby the Company issued 5,500,000 common shares at a public offering price of $15.00 per share. The shares began trading on The Nasdaq Global Select Market on May 9, 2019. On May 15, 2019, the underwriters fully exercised their option to purchase an additional 825,000 common shares at the public offering price of $15.00 per share. The gross proceeds received by the Company from the offering were $94.9 million, before deducting underwriting discounts and commissions and other estimated offering expenses payable by the Company. Upon the closing of the IPO, 24,490,742 common shares were outstanding, which included all outstanding shares of Class A1, A2, B, C, D1 and D2 preferred shares that converted into 17,550,802 common shares.