Her bid to make Scotland the first part of the UK to change the law was defeated 85-16 in a free vote that allowed MSPs to vote with their consciences and not along party lines.
Ms MacDonald said the outcome was what she had expected.
Margo MacDonald has pledged she will try again to legalise assisted suicide if she is re-elected to the Scottish Parliament, after her controversial End of Life Assistance Bill was overwhelmingly rejected by MSPs.
Her bid to make Scotland the first part of the UK to change the law was defeated 85-16 in a free vote that allowed MSPs to vote with their consciences and not along party lines.
Ms MacDonald said the outcome was what she had expected.