Fast-acting sildenafil lozenges promote quick absorption and rapid onset. Sildenafil lozenges kick in faster than their tablet counterpart, in as little as 15 minutes. Since the lozenges are dissolved under the tongue they start working much faster than a tablet that has to pass through the digestive system. A sublingual dosage form is not as effected by food ingestion as the orally administered tablets.
Studies have shown that sublingual sildenafil is safe and effective. In one study, sixty‐five percent of patients (13/20) who received sublingual sildenafil achieved satisfying erections and coitus, whereas the rate was 15% in the placebo group (3/20). Minimal side effects were noticed and included headache, sweating, and flushing.