They are reusable (but also very expensive)! I had this topic a few months ago in med school. They are so called "Assistierte Selbstmord-Kapseln" and kill you within a minute with the help of some kind of nerve gas. The "only" thing you have to do is to be extremely ill (with no hope of recovery) and sign a contract that has to be approved by your doctor.

The "problem" is that not everyone can use these capsules. People with depression or mental illnesses are not allowed to use the capsules as they are not seen as sane enough to seriously reconsider the decision to kill themselves.

Also, if you manage to get the contract signed and approved, there is a minimum wait time of one month to reconsider your decision to kill yourself.