Along with its needed effects, fluoxetine (the active ingredient contained in Prozac) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. In Summary. Commonly reported side effects of sertraline include: diarrhea, dizziness, drowsiness, dyspepsia, fatigue, insomnia, loose stools, nausea, tremor. Sexual dysfunction, including loss of libido, anorgasmia, lack of vaginal lubrication, and erectile dysfunction, are some of the most commonly encountered adverse effects of treatment with fluoxetine and other SSRIs. Prozac can cause serious side effects. Severe allergic reactions could result in death. Seek emergency medical treatment right away if, after taking Prozac, you experience any of the following. You love your dogs with all your heart; it’s their “issues” that are the real heartbreaker. Separation anxiety, obsessive behaviors, thunderstorm phobia — all these things can take a toll on your dog and your household, and if your veterinarian has suggested Prozac as a remedy, you have a decision to make. SIDE EFFECTS. The following adverse reactions are discussed in greater detail in other sections of the labeling: Known hypersensitivity to amphetamine products or other ingredients of VYVANSE [see CONTRAINDICATIONS] Find a comprehensive guide to possible side effects including common and rare side effects when taking Zoloft (Sertraline Hcl) for healthcare professionals and consumers. Antidepressant Warnings: There have been 151 warnings from 11 countries (Australia, Canada, Denmark, Germany, Ireland, Italy, Japan, New Zealand, Russia, United Kingdom and United States) and the European Union warning that antidepressants cause harmful side effects. Insomnia, weight gain, sexual dysfunction emerge as problems affecting compliance Physicians are seeing long-term side effects with selective serotonin reuptake inhibitors far in excess of what was expected from clinical trial data. I have been on 20mg of prozac scince may of 2006. 5 weeks ago I decided to taper off taking 20mg and 10mg on alternating days. I was fine until about 3 days ago. now I have uncontrollable crying, a creepy crawling sensation and find my self having a lump in throat and having trouble breathing.