Related by context. Frequent words. (Click for all words.) 70 nausea headache 69 nausea fatigue 69 nausea diarrhea 69 headache dizziness 69 headache nausea 68 fatigue nausea 65 nausea vomiting 63 PDE5 inhibitors 63 diarrhea nausea 63 frequent urination 62 dizziness nausea 62 decreased libido 62 drowsiness 61 muscle ache 61 photosensitivity 60 nausea dizziness 60 Antihistamines 60 alpha blockers 60 anxiety insomnia 60 orthostatic hypotension 59 Allergic reactions 59 vaginal dryness 59 nausea 59 profuse sweating 59 vomiting nausea 58 nausea vomiting diarrhea 58 urinary retention 58 macular edema 58 gastrointestinal GI 58 constipation 58 Adverse reactions 58 vasomotor symptoms 58 redness 57 gastrointestinal 57 myalgia 57 fluid retention 57 muscle aches 57 nasopharyngitis 57 anticholinergic 57 redness swelling 57 NAION 56 mouth sores 56 Obstructive sleep apnea 56 nasal congestion 56 QT prolongation 56 abdominal cramping 56 seborrheic dermatitis 56 xerostomia 56 vaginal atrophy 55 dyspepsia 55 peripheral edema 55 muscle cramps 55 breast tenderness 55 priapism 55 fever chills 55 itchiness 55 hyperkalemia 55 nasal polyps 55 diarrhea abdominal pain 55 menorrhagia 55 excessive daytime sleepiness 55 menstrual pain 55 facial swelling 55 excessive sweating 54 hot flushes 54 leukopenia 54 angina pectoris 54 tricyclic antidepressants 54 tachycardia 54 light headedness 54 premenstrual syndrome 54 nifedipine 54 skin rash 54 rhinitis 54 benign prostatic hyperplasia 54 urinary infections 54 reflux disease 54 heavy menstrual bleeding 54 hypotension 54 asthenia 54 stuffy nose 54 lactic acidosis 54 pruritus 53 canker sores 53 myelosuppression 53 urinary symptoms 53 involuntary movements 53 insomnia 53 urinary tract symptoms 53 RLS symptoms 53 mouth ulcers 53 angioedema 53 triptans 53 urticaria 53 fever nausea 53 hepatotoxicity 53 sleepiness 53 inflammations 53 bloody stools 53 Hypoglycemia 53 hot flashes