| May exacerbate physiologic tremor | May reduce physiologic tremor |
| Amphetamines | Alcohol |
| Beta-adrenergic agonists (albuterol [Proventil]) | Benzodiazepines |
| Beta-adrenergic antagonists (propranolol [Inderal]) | |
| Caffeine | |
| Carbamazepine (Tegretol) | Primidone (Mysoline) |
| Epinephrine | |
| Fluoxetine (Prozac) | |
| Haloperidol (Haldol) | |
| Hypoglycemic agents | |
| Lithium | |
| Methylphenidate (Ritalin) | |
| Pseudoephedrine | |
| Terbutaline sulfate (Brethine) | |
| Theophylline | |
| Thyroid hormones | |
| Tricyclic antidepressants | |
| Valproic acid (Depakene) |