The findings of meta-analyses and randomized placebo-controlled treatment studies indicate that a range of approaches are efficacious in acute treatment. Pharmacological and psychological treatments, when delivered singly, have broadly similar efficacy in acute treatment. However, acute treatment with cognitive therapy (group or individual) may be associated with a reduced risk of symptomatic relapse at follow-up. Cognitive behaviour therapy is efficacious in adults and children: cognitive therapy appears superior to exposure therapy, but the evidence for the efficacy of social skills training is less strong. It is unlikely that the combination of pharmacological with psychological treatments is associated with greater overall efficacy than with either treatment, when given alone, as only 1 of 4 studies of the relative efficacy of combination treatment found evidence for superior efficacy.

Antidepressant drugs with proven efficacy include most SSRIs, the SNRI venlafaxine, the MAOI phenelzine and the RIMA moclobemide: the potential efficacy of tricyclic antidepressants is unknown. Some benzodiazepines and anticonvulsants and the antipsychotic olanzapine also appear efficacious in acute treatment. A number of small single-dose placebo-controlled crossover studies together suggest that beta-blockers can be beneficial in reducing anxiety symptoms in individuals with ‘performance anxiety’ (for example, when speaking in public), which overlaps with mild non-generalized social anxiety disorder. Acute treatment studies indicate that the proportion of responding patients increases steadily over time. A post-hoc analysis of the clinical trial database with paroxetine indicates that many non-responders to treatment at 8 weeks become responders with a further 4 weeks of double-blind treatment: however a post-hoc analysis of the clinical trial database for escitalopram indicates that response is unlikely if there is no onset of clinical effect within the first 4 weeks of treatment.

The findings of randomized placebo-controlled relapse prevention studies in patients who have responded to previous acute treatment reveal a significant advantage for staying on active medication (clonazepam, escitalopram, paroxetine, pregabalin, sertraline) for up to six months. Fixed-dose randomized controlled trials do not provide consistent evidence of a dose-response relationship with antidepressant drugs: but a fixed-dose study of pregabalin found that only the higher daily dosage was efficacious. A double-blind randomized controlled dosage escalation trial found no advantage for increasing to a higher daily dosage (of duloxetine), when compared to continuing treatment with a lower dosage. Switching between treatments with proven efficacy may be helpful. An uncontrolled study of augmentation of SSRI treatment with buspirone found some evidence of beneficial effects; but a placebo-controlled crossover-study of the augmentation of paroxetine with pindolol found no evidence of efficacy. A small placebo-controlled study of the augmentation of paroxetine with clonazepam found the combination was marginally short of superiority, when compared to paroxetine alone.

The author has not supplied his declaration of competing interest.