Alkanes are saturated hydrocarbons. Saturated means that the hydrocarbon has only single bonds and that the hydrocarbon contains the maximum number of hydrogen atoms for each carbon atom.
Antidepressants work by stopping the breakdown of norepinephrine, dopamine, and serotonin. They're more difficult for people to take than most other antidepressants because they interact with prescription drugs, nonprescription drugs, and some foods.