| | Drug Name | pH range | Known iv reactions | Number of reports to extravasation.org.uk | | Sotalol | 4.3 - 5.2 | | 0 |
| Streptokinase | 6.8 - 7.5 | | 0 |
| Streptomycin | 5.0 - 8.0 | | 0 |
| Sulphadiazine | 11 (approximately) | Toxic epidermal necrolysis, rashes not as a direct result of administration | 0 |
| Sumatriptan | | Pain at injection site | 0 |
| Suxamethonium | 4.0 - 4.5 | | 0 |
| Tacrolimus | | | 0 |
| Teicoplanin | 7.5 | Rash, pruritus, urticaria and bronchospasm. | 0 |
| Tenoxicam | | | 0 |
| Terbutaline | 3.0 - 5.0 | | 0 |
| Terbutaline sulphate | 3.0 - 5.0 | | 0 |
| Terlipressin | | | 0 |
| Tetracosactrin | 3.8 - 4.5 | | 0 |
| Thiamine (hydrochloride) | 2.5 - 4.5 | Anaphylactic reaction produced on injection, mild soreness at site of injection, puritus, urticaria. | 0 |
| Thiopental (sodium) | 80mg/ml solution in water has pH range of 10.2 - 11.2 | Pain on injection, venous thrombosis | 0 |
| Thiopentone | 10.5 (2.5% solution) | | 0 |
| Tirofiban | | | 0 |
| Tobramycin (sulphate) | 3.5 - 6.0 | Pain at injection site, phlebitis and skin reactions, urticaria, local erythema. | 0 |
| Tramadol hydrochloride | 6.0 - 6.8 | | 0 |
| Tranexamic acid | 6.5 - 8.0 | | 0 |
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