In Clayworth v. Pfizer, Inc.,  ___ Cal.4th ____ (2010), the California Supreme Court held that, to have standing to seek an injunction, the plaintiff need not have suffered a restitutionary loss: 

The Court of Appeal held Pharmacies were barred from seeking injunctive relief because, it concluded, they had suffered no monetary loss. To the extent this holding rests on the conclusion Pharmacies lacked standing under section 17204, it is erroneous; as discussed ante, Pharmacies have standing. To the extent the holding rests on the conclusion that even if Pharmacies had standing, they could not seek injunctive relief unless they could also seek restitution, it similarly is erroneous. Section 17203 makes injunctive relief “the primary form of relief available under the UCL,” while restitution is merely “ancillary.” (In re Tobacco II Cases (2009) 46 Cal.4th 298, 319.) Nothing in the statute’s language conditions a court’s authority to order injunctive relief on the need in a given case to also order restitution. Accordingly, the right to seek injunctive relief under section 17203 is not dependent on the right to seek restitution; the two are wholly independent remedies. (See ABC Internat. Traders, Inc. v. Matsushita Electric Corp. (1997) 14 Cal.4th 1247, 1268 [§ 17203 “contains . . . no language of condition linking injunctive and restitutionary relief”]; Prata v. Superior Court (2001) 91 Cal.App.4th 1128, 1139 [plaintiff could pursue injunctive relief even though restitution was unavailable].)

While probably most important in intra-competitor matters, the decision may affect circumstances under which a consumer can use the UCL to seek injunctive relief against a defendant notwithstanding the absence of restitutionary loss.