St. John's Wort is a thoroughly researched herb, extensively prescribed by physicians in Europe for depression and anxiety. It has proven superior to placebo and at least as effective as amitriptyline, imipramine, maprotiline and paroxetine and usually produced fewer side effects. Insomnia and increased sun sensitivity sometimes increase with use of this herbal preparation. St. John's Wort effect is similar to serotonin reuptake inhibitors although dopamine, interleukin and cortisol levels also appear to be affected. Some St. John's Wort formulas contain Cadmium or Lead contamination and others do not contain the advertised or claimed amounts of hypericum. Unlike tryptophan, 5-hydroxytryptophan, phenylalanine, tyrosine and SAMe which naturally occur in the body, St. John's Wort interacts with many medications. Zhou S, et. al. (2004) reports.

St John's Wort decreased the blood concentrations of amitriptyline, cyclosporine, digoxin, fexofenadine, indinavir, methadone, midazolam, nevirapine, phenprocoumon, simvastatin, tacrolimus, theophylline and warfarin, whereas it did not alter the pharmacokinetics of carbamazepine, dextromethorphan, mycophenolic acid and pravastatin. St John's Wort decreased the plasma concentration of the active metabolite SN-38 in cancer patients receiving irinotecan treatment. St John's Wort did not alter the pharmacokinetics of tolbutamide, but increased the incidence of hypoglycaemia. Several cases have been reported that St John's Wort decreased cyclosporine blood concentration leading to organ rejection. St John's Wort caused breakthrough bleeding and unplanned pregnancies when used concomitantly with oral contraceptives. It also caused serotonin syndrome when co administered with selective serotonin-reuptake inhibitors (e.g. sertaline and paroxetine).

Some alcoholics and bipolar patients require treatment with an anticonvulsant, even after adequate magnesium levels are restored. Valproic acid and gabapentin have proven effective. In some cases anxiety will persist. Acamprosate is non addictive and offers new possibilities for reducing the anxiety of alcohol withdrawal and early abstinence. Insomnia is also common in the abstinent alcoholic. In some cases, tranquilizers may be needed temporarily to deal with insomnia, while melatonin, and amino acid supplementation are adequate for others.