Falling Out of Love - Yet Another Side Effect of Anti-Depressants

Selective Serotonin Reuptake Inhibitors (or SSRIs) are drugs like Zoloft and Prozac. These drugs have many side effects - they've had black box warnings put on them as these drugs have shown to increase suicidal tendencies in kids and teens. Now it's been found that it can cause people to no longer be in love with their significant other. This makes me wonder - if these anti-depressants make someone no longer in love with another person - what is there to prevent the drug from making the user fall out of love with other things? In my opinion, the opposite of being depressed is being happy. Would you be happy if a drug made you no longer love your significant other? Wouldn't that make you wonder if the drug was making you no longer love other things or activities that you used to enjoy? How does that make someone less depressed?