Extra Strength Strepsils Chesty Cough Lozenge Targeted relief. Extra strength. Available in a pack size of 24. Strepsils Dual Action Lozenge Specially designed for severe sore throats. The dual action formula contains two antiseptics and a powerful anaesthetic to numb pain. Strepsils Max Lozenge Extra Strength. Targeted Relief. Available in a pack size of 16. Strepsils Strepfen Honey & Lemon Lozenge Strepfen contains the anti-inflammatory and analgesic Flurbiprofen, providing fast, effective pain relief without numbing.