No, it is not morally wrong to provide these drugs as it is likely that people who will use them have made up their minds and will attempt suicide in some other manner. These drugs make it more likely that others aren't affected by these suicides and that the process is quick and painless.
It is not morally wrong to provide free drugs for assisted suicide to the extent that the recipient of the drugs should not be held to some moral standard. However, it is immoral to extract money from taxpayers to pay for drugs to assist in a suicide. Government needs to stay out of these issues.
People should be able to control their lives, including the way in which they end, so I don't feel like assisted suicide is immoral and therefore providing drugs to do so is not immoral. In today's medical environment, I understand how people may feel like they have lived too long and if they want to end their life they shouldn't be prevented from doing so because of lack of funds to acquire the drugs. To me, this isn't even a question of morality.
Canada recently passed legislation allowing assisted suicides. The law will allow those that are terminally ill to die with dignity on their own terms. People should have the right to choose when to end their suffering. In order to accomplish this, drugs are needed for someone to pass peacefully. In the interest of fairness to those that cannot afford the drugs, these should be provided free of charge.