| Antidepressants and anxiolytics |
| Alprazolam (Xanax) |
| Buspirone (BuSpar) |
| Monoamine oxidase inhibitors |
| | Moclobemide (Manerix; available in Canada) |
| Selective serotonin reuptake inhibitors |
| | Citalopram (Celexa) |
| | Fluoxetine (Prozac) |
| | Paroxetine (Paxil) |
| | Sertraline (Zoloft) |
| Tricyclic antidepressants |
| Antihypertensives |
| Atenolol (Tenormin) |
| Methyldopa (Aldomet) |
| Reserpine (Serpasil) |
| Verapamil (Calan) |
| Antipsychotics |
| Histamine H2-receptor blockers |
| Cimetidine (Tagamet) |
| Famotidine (Pepcid) |
| Ranitidine (Zantac) |
| Hormones |
| Conjugated estrogen and medroxyprogesterone (Premphase, Prempro) |
| Medroxyprogesterone contraceptive injections (Depo-Provera) |
| Oral contraceptive formulations |
| Phenothiazines |
| Chlorpromazine (Thorazine) |
| Prochlorperazine (Compazine) |
| Others |
| Other drugs |
| Amphetamines |
| Anesthetics |
| Arginine |
| Cannabis |
| Cisapride (Propulsid) |
| Cyclobenzaprine (Flexeril) |
| Danazol (Danocrine) |
| Dihydroergotamine (DHE 45) |
| Domperidone (Motilium; available in Canada and Mexico) |
| Isoniazid (INH) |
| Metoclopramide (Reglan) |
| Octreotide (Sandostatin) |
| Opiates |
| Rimantadine (Flumadine) |
| Sumatriptan (Imitrex) |
| Valproic acid (Depakene) |
| Herbs |
| Anise |
| Blessed thistle |
| Fennel |
| Fenugreek seed |
| Marshmallow |
| Nettle |
| Red clover |
| Red raspberry |